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# 异常处理
The functions described in this chapter will let you handle and raise Python exceptions. It is important to understand some of the basics of Python exception handling. It works somewhat like the POSIX `errno` variable: there is a global indicator (per thread) of the last error that occurred. Most C API functions don't clear this on success, but will set it to indicate the cause of the error on failure. Most C API functions also return an error indicator, usually *NULL* if they are supposed to return a pointer, or `-1`if they return an integer (exception: the `PyArg_*()` functions return `1` for success and `0` for failure).
Concretely, the error indicator consists of three object pointers: the exception's type, the exception's value, and the traceback object. Any of those pointers can be NULL if non-set (although some combinations are forbidden, for example you can't have a non-NULL traceback if the exception type is NULL).
When a function must fail because some function it called failed, it generally doesn't set the error indicator; the function it called already set it. It is responsible for either handling the error and clearing the exception or returning after cleaning up any resources it holds (such as object references or memory allocations); it should *not* continue normally if it is not prepared to handle the error. If returning due to an error, it is important to indicate to the caller that an error has been set. If the error is not handled or carefully propagated, additional calls into the Python/C API may not behave as intended and may fail in mysterious ways.
注解
The error indicator is **not** the result of [`sys.exc_info()`](../library/sys.xhtml#sys.exc_info "sys.exc_info"). The former corresponds to an exception that is not yet caught (and is therefore still propagating), while the latter returns an exception after it is caught (and has therefore stopped propagating).
## Printing and clearing
void `PyErr_Clear`()Clear the error indicator. If the error indicator is not set, there is no effect.
void `PyErr_PrintEx`(int *set\_sys\_last\_vars*)Print a standard traceback to `sys.stderr` and clear the error indicator. **Unless** the error is a `SystemExit`. In that case the no traceback is printed and Python process will exit with the error code specified by the `SystemExit` instance.
Call this function **only** when the error indicator is set. Otherwise it will cause a fatal error!
If *set\_sys\_last\_vars* is nonzero, the variables [`sys.last_type`](../library/sys.xhtml#sys.last_type "sys.last_type"), [`sys.last_value`](../library/sys.xhtml#sys.last_value "sys.last_value") and [`sys.last_traceback`](../library/sys.xhtml#sys.last_traceback "sys.last_traceback") will be set to the type, value and traceback of the printed exception, respectively.
void `PyErr_Print`()Alias for `PyErr_PrintEx(1)`.
void `PyErr_WriteUnraisable`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*obj*)This utility function prints a warning message to `sys.stderr` when an exception has been set but it is impossible for the interpreter to actually raise the exception. It is used, for example, when an exception occurs in an [`__del__()`](../reference/datamodel.xhtml#object.__del__ "object.__del__") method.
The function is called with a single argument *obj* that identifies the context in which the unraisable exception occurred. If possible, the repr of *obj* will be printed in the warning message.
## 抛出异常
These functions help you set the current thread's error indicator. For convenience, some of these functions will always return a NULL pointer for use in a `return` statement.
void `PyErr_SetString`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*type*, const char *\*message*)This is the most common way to set the error indicator. The first argument specifies the exception type; it is normally one of the standard exceptions, e.g. `PyExc_RuntimeError`. You need not increment its reference count. The second argument is an error message; it is decoded from `'utf-8`'.
void `PyErr_SetObject`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*type*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*value*)This function is similar to [`PyErr_SetString()`](#c.PyErr_SetString "PyErr_SetString") but lets you specify an arbitrary Python object for the "value" of the exception.
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyErr_Format`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exception*, const char *\*format*, ...)*Return value: Always NULL.*This function sets the error indicator and returns *NULL*. *exception*should be a Python exception class. The *format* and subsequent parameters help format the error message; they have the same meaning and values as in [`PyUnicode_FromFormat()`](unicode.xhtml#c.PyUnicode_FromFormat "PyUnicode_FromFormat"). *format* is an ASCII-encoded string.
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyErr_FormatV`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exception*, const char *\*format*, va\_list *vargs*)*Return value: Always NULL.*Same as [`PyErr_Format()`](#c.PyErr_Format "PyErr_Format"), but taking a `va_list` argument rather than a variable number of arguments.
3\.5 新版功能.
void `PyErr_SetNone`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*type*)This is a shorthand for `PyErr_SetObject(type, Py_None)`.
int `PyErr_BadArgument`()This is a shorthand for `PyErr_SetString(PyExc_TypeError, message)`, where *message* indicates that a built-in operation was invoked with an illegal argument. It is mostly for internal use.
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyErr_NoMemory`()*Return value: Always NULL.*This is a shorthand for `PyErr_SetNone(PyExc_MemoryError)`; it returns *NULL*so an object allocation function can write `return PyErr_NoMemory();` when it runs out of memory.
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyErr_SetFromErrno`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*type*)*Return value: Always NULL.*This is a convenience function to raise an exception when a C library function has returned an error and set the C variable `errno`. It constructs a tuple object whose first item is the integer `errno` value and whose second item is the corresponding error message (gotten from `strerror()`), and then calls `PyErr_SetObject(type, object)`. On Unix, when the `errno` value is `EINTR`, indicating an interrupted system call, this calls [`PyErr_CheckSignals()`](#c.PyErr_CheckSignals "PyErr_CheckSignals"), and if that set the error indicator, leaves it set to that. The function always returns *NULL*, so a wrapper function around a system call can write `return PyErr_SetFromErrno(type);`when the system call returns an error.
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyErr_SetFromErrnoWithFilenameObject`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*type*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*filenameObject*)*Return value: Always NULL.*Similar to [`PyErr_SetFromErrno()`](#c.PyErr_SetFromErrno "PyErr_SetFromErrno"), with the additional behavior that if *filenameObject* is not *NULL*, it is passed to the constructor of *type* as a third parameter. In the case of [`OSError`](../library/exceptions.xhtml#OSError "OSError") exception, this is used to define the `filename` attribute of the exception instance.
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyErr_SetFromErrnoWithFilenameObjects`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*type*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*filenameObject*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*filenameObject2*)*Return value: Always NULL.*Similar to [`PyErr_SetFromErrnoWithFilenameObject()`](#c.PyErr_SetFromErrnoWithFilenameObject "PyErr_SetFromErrnoWithFilenameObject"), but takes a second filename object, for raising errors when a function that takes two filenames fails.
3\.4 新版功能.
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyErr_SetFromErrnoWithFilename`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*type*, const char *\*filename*)*Return value: Always NULL.*Similar to [`PyErr_SetFromErrnoWithFilenameObject()`](#c.PyErr_SetFromErrnoWithFilenameObject "PyErr_SetFromErrnoWithFilenameObject"), but the filename is given as a C string. *filename* is decoded from the filesystem encoding ([`os.fsdecode()`](../library/os.xhtml#os.fsdecode "os.fsdecode")).
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyErr_SetFromWindowsErr`(int *ierr*)*Return value: Always NULL.*This is a convenience function to raise [`WindowsError`](../library/exceptions.xhtml#WindowsError "WindowsError"). If called with *ierr* of `0`, the error code returned by a call to `GetLastError()`is used instead. It calls the Win32 function `FormatMessage()` to retrieve the Windows description of error code given by *ierr* or `GetLastError()`, then it constructs a tuple object whose first item is the *ierr* value and whose second item is the corresponding error message (gotten from `FormatMessage()`), and then calls
```
PyErr_SetObject(PyExc_WindowsError,
object)
```
. This function always returns *NULL*.
[可用性](../library/intro.xhtml#availability): Windows。
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyErr_SetExcFromWindowsErr`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*type*, int *ierr*)*Return value: Always NULL.*Similar to [`PyErr_SetFromWindowsErr()`](#c.PyErr_SetFromWindowsErr "PyErr_SetFromWindowsErr"), with an additional parameter specifying the exception type to be raised.
[可用性](../library/intro.xhtml#availability): Windows。
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyErr_SetFromWindowsErrWithFilename`(int *ierr*, const char *\*filename*)*Return value: Always NULL.*Similar to `PyErr_SetFromWindowsErrWithFilenameObject()`, but the filename is given as a C string. *filename* is decoded from the filesystem encoding ([`os.fsdecode()`](../library/os.xhtml#os.fsdecode "os.fsdecode")).
[可用性](../library/intro.xhtml#availability): Windows。
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyErr_SetExcFromWindowsErrWithFilenameObject`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*type*, int *ierr*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*filename*)*Return value: Always NULL.*Similar to `PyErr_SetFromWindowsErrWithFilenameObject()`, with an additional parameter specifying the exception type to be raised.
[可用性](../library/intro.xhtml#availability): Windows。
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyErr_SetExcFromWindowsErrWithFilenameObjects`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*type*, int *ierr*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*filename*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*filename2*)*Return value: Always NULL.*Similar to [`PyErr_SetExcFromWindowsErrWithFilenameObject()`](#c.PyErr_SetExcFromWindowsErrWithFilenameObject "PyErr_SetExcFromWindowsErrWithFilenameObject"), but accepts a second filename object.
[可用性](../library/intro.xhtml#availability): Windows。
3\.4 新版功能.
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyErr_SetExcFromWindowsErrWithFilename`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*type*, int *ierr*, const char *\*filename*)*Return value: Always NULL.*Similar to [`PyErr_SetFromWindowsErrWithFilename()`](#c.PyErr_SetFromWindowsErrWithFilename "PyErr_SetFromWindowsErrWithFilename"), with an additional parameter specifying the exception type to be raised.
[可用性](../library/intro.xhtml#availability): Windows。
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyErr_SetImportError`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*msg*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*name*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*path*)*Return value: Always NULL.*This is a convenience function to raise [`ImportError`](../library/exceptions.xhtml#ImportError "ImportError"). *msg* will be set as the exception's message string. *name* and *path*, both of which can be `NULL`, will be set as the [`ImportError`](../library/exceptions.xhtml#ImportError "ImportError")'s respective `name`and `path` attributes.
3\.3 新版功能.
void `PyErr_SyntaxLocationObject`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*filename*, int *lineno*, int *col\_offset*)Set file, line, and offset information for the current exception. If the current exception is not a [`SyntaxError`](../library/exceptions.xhtml#SyntaxError "SyntaxError"), then it sets additional attributes, which make the exception printing subsystem think the exception is a [`SyntaxError`](../library/exceptions.xhtml#SyntaxError "SyntaxError").
3\.4 新版功能.
void `PyErr_SyntaxLocationEx`(const char *\*filename*, int *lineno*, int *col\_offset*)Like [`PyErr_SyntaxLocationObject()`](#c.PyErr_SyntaxLocationObject "PyErr_SyntaxLocationObject"), but *filename* is a byte string decoded from the filesystem encoding ([`os.fsdecode()`](../library/os.xhtml#os.fsdecode "os.fsdecode")).
3\.2 新版功能.
void `PyErr_SyntaxLocation`(const char *\*filename*, int *lineno*)Like [`PyErr_SyntaxLocationEx()`](#c.PyErr_SyntaxLocationEx "PyErr_SyntaxLocationEx"), but the col\_offset parameter is omitted.
void `PyErr_BadInternalCall`()This is a shorthand for `PyErr_SetString(PyExc_SystemError, message)`, where *message* indicates that an internal operation (e.g. a Python/C API function) was invoked with an illegal argument. It is mostly for internal use.
## Issuing warnings
Use these functions to issue warnings from C code. They mirror similar functions exported by the Python [`warnings`](../library/warnings.xhtml#module-warnings "warnings: Issue warning messages and control their disposition.") module. They normally print a warning message to *sys.stderr*; however, it is also possible that the user has specified that warnings are to be turned into errors, and in that case they will raise an exception. It is also possible that the functions raise an exception because of a problem with the warning machinery. The return value is `0` if no exception is raised, or `-1` if an exception is raised. (It is not possible to determine whether a warning message is actually printed, nor what the reason is for the exception; this is intentional.) If an exception is raised, the caller should do its normal exception handling (for example, [`Py_DECREF()`](refcounting.xhtml#c.Py_DECREF "Py_DECREF") owned references and return an error value).
int `PyErr_WarnEx`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*category*, const char *\*message*, Py\_ssize\_t *stack\_level*)Issue a warning message. The *category* argument is a warning category (see below) or *NULL*; the *message* argument is a UTF-8 encoded string. *stack\_level* is a positive number giving a number of stack frames; the warning will be issued from the currently executing line of code in that stack frame. A *stack\_level* of 1 is the function calling [`PyErr_WarnEx()`](#c.PyErr_WarnEx "PyErr_WarnEx"), 2 is the function above that, and so forth.
Warning categories must be subclasses of `PyExc_Warning`; `PyExc_Warning` is a subclass of `PyExc_Exception`; the default warning category is `PyExc_RuntimeWarning`. The standard Python warning categories are available as global variables whose names are enumerated at [标准警告类别](#standardwarningcategories).
For information about warning control, see the documentation for the [`warnings`](../library/warnings.xhtml#module-warnings "warnings: Issue warning messages and control their disposition.") module and the [`-W`](../using/cmdline.xhtml#cmdoption-w) option in the command line documentation. There is no C API for warning control.
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyErr_SetImportErrorSubclass`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*msg*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*name*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*path*)*Return value: Always NULL.*Much like [`PyErr_SetImportError()`](#c.PyErr_SetImportError "PyErr_SetImportError") but this function allows for specifying a subclass of [`ImportError`](../library/exceptions.xhtml#ImportError "ImportError") to raise.
3\.6 新版功能.
int `PyErr_WarnExplicitObject`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*category*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*message*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*filename*, int *lineno*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*module*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*registry*)Issue a warning message with explicit control over all warning attributes. This is a straightforward wrapper around the Python function [`warnings.warn_explicit()`](../library/warnings.xhtml#warnings.warn_explicit "warnings.warn_explicit"), see there for more information. The *module*and *registry* arguments may be set to *NULL* to get the default effect described there.
3\.4 新版功能.
int `PyErr_WarnExplicit`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*category*, const char *\*message*, const char *\*filename*, int *lineno*, const char *\*module*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*registry*)Similar to [`PyErr_WarnExplicitObject()`](#c.PyErr_WarnExplicitObject "PyErr_WarnExplicitObject") except that *message* and *module* are UTF-8 encoded strings, and *filename* is decoded from the filesystem encoding ([`os.fsdecode()`](../library/os.xhtml#os.fsdecode "os.fsdecode")).
int `PyErr_WarnFormat`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*category*, Py\_ssize\_t *stack\_level*, const char *\*format*, ...)Function similar to [`PyErr_WarnEx()`](#c.PyErr_WarnEx "PyErr_WarnEx"), but use [`PyUnicode_FromFormat()`](unicode.xhtml#c.PyUnicode_FromFormat "PyUnicode_FromFormat") to format the warning message. *format* is an ASCII-encoded string.
3\.2 新版功能.
int `PyErr_ResourceWarning`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*source*, Py\_ssize\_t *stack\_level*, const char *\*format*, ...)Function similar to [`PyErr_WarnFormat()`](#c.PyErr_WarnFormat "PyErr_WarnFormat"), but *category* is [`ResourceWarning`](../library/exceptions.xhtml#ResourceWarning "ResourceWarning") and pass *source* to `warnings.WarningMessage()`.
3\.6 新版功能.
## Querying the error indicator
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyErr_Occurred`()*Return value: Borrowed reference.*Test whether the error indicator is set. If set, return the exception *type*(the first argument to the last call to one of the `PyErr_Set*()`functions or to [`PyErr_Restore()`](#c.PyErr_Restore "PyErr_Restore")). If not set, return *NULL*. You do not own a reference to the return value, so you do not need to [`Py_DECREF()`](refcounting.xhtml#c.Py_DECREF "Py_DECREF")it.
注解
Do not compare the return value to a specific exception; use [`PyErr_ExceptionMatches()`](#c.PyErr_ExceptionMatches "PyErr_ExceptionMatches") instead, shown below. (The comparison could easily fail since the exception may be an instance instead of a class, in the case of a class exception, or it may be a subclass of the expected exception.)
int `PyErr_ExceptionMatches`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*)Equivalent to `PyErr_GivenExceptionMatches(PyErr_Occurred(), exc)`. This should only be called when an exception is actually set; a memory access violation will occur if no exception has been raised.
int `PyErr_GivenExceptionMatches`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*given*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*)Return true if the *given* exception matches the exception type in *exc*. If *exc* is a class object, this also returns true when *given* is an instance of a subclass. If *exc* is a tuple, all exception types in the tuple (and recursively in subtuples) are searched for a match.
void `PyErr_Fetch`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*\*ptype*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*\*pvalue*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*\*ptraceback*)Retrieve the error indicator into three variables whose addresses are passed. If the error indicator is not set, set all three variables to *NULL*. If it is set, it will be cleared and you own a reference to each object retrieved. The value and traceback object may be *NULL* even when the type object is not.
注解
This function is normally only used by code that needs to catch exceptions or by code that needs to save and restore the error indicator temporarily, e.g.:
```
{
PyObject *type, *value, *traceback;
PyErr_Fetch(&type, &value, &traceback);
/* ... code that might produce other errors ... */
PyErr_Restore(type, value, traceback);
}
```
void `PyErr_Restore`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*type*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*value*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*traceback*)Set the error indicator from the three objects. If the error indicator is already set, it is cleared first. If the objects are *NULL*, the error indicator is cleared. Do not pass a *NULL* type and non-*NULL* value or traceback. The exception type should be a class. Do not pass an invalid exception type or value. (Violating these rules will cause subtle problems later.) This call takes away a reference to each object: you must own a reference to each object before the call and after the call you no longer own these references. (If you don't understand this, don't use this function. I warned you.)
注解
This function is normally only used by code that needs to save and restore the error indicator temporarily. Use [`PyErr_Fetch()`](#c.PyErr_Fetch "PyErr_Fetch") to save the current error indicator.
void `PyErr_NormalizeException`([PyObject](structures.xhtml#c.PyObject "PyObject")\*\*exc, [PyObject](structures.xhtml#c.PyObject "PyObject")\*\*val, [PyObject](structures.xhtml#c.PyObject "PyObject")\*\*tb)Under certain circumstances, the values returned by [`PyErr_Fetch()`](#c.PyErr_Fetch "PyErr_Fetch") below can be "unnormalized", meaning that `*exc` is a class object but `*val` is not an instance of the same class. This function can be used to instantiate the class in that case. If the values are already normalized, nothing happens. The delayed normalization is implemented to improve performance.
注解
This function *does not* implicitly set the `__traceback__`attribute on the exception value. If setting the traceback appropriately is desired, the following additional snippet is needed:
```
if (tb != NULL) {
PyException_SetTraceback(val, tb);
}
```
void `PyErr_GetExcInfo`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*\*ptype*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*\*pvalue*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*\*ptraceback*)Retrieve the exception info, as known from `sys.exc_info()`. This refers to an exception that was *already caught*, not to an exception that was freshly raised. Returns new references for the three objects, any of which may be *NULL*. Does not modify the exception info state.
注解
This function is not normally used by code that wants to handle exceptions. Rather, it can be used when code needs to save and restore the exception state temporarily. Use [`PyErr_SetExcInfo()`](#c.PyErr_SetExcInfo "PyErr_SetExcInfo") to restore or clear the exception state.
3\.3 新版功能.
void `PyErr_SetExcInfo`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*type*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*value*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*traceback*)Set the exception info, as known from `sys.exc_info()`. This refers to an exception that was *already caught*, not to an exception that was freshly raised. This function steals the references of the arguments. To clear the exception state, pass *NULL* for all three arguments. For general rules about the three arguments, see [`PyErr_Restore()`](#c.PyErr_Restore "PyErr_Restore").
注解
This function is not normally used by code that wants to handle exceptions. Rather, it can be used when code needs to save and restore the exception state temporarily. Use [`PyErr_GetExcInfo()`](#c.PyErr_GetExcInfo "PyErr_GetExcInfo") to read the exception state.
3\.3 新版功能.
## Signal Handling
int `PyErr_CheckSignals`()This function interacts with Python's signal handling. It checks whether a signal has been sent to the processes and if so, invokes the corresponding signal handler. If the [`signal`](../library/signal.xhtml#module-signal "signal: Set handlers for asynchronous events.") module is supported, this can invoke a signal handler written in Python. In all cases, the default effect for `SIGINT` is to raise the [`KeyboardInterrupt`](../library/exceptions.xhtml#KeyboardInterrupt "KeyboardInterrupt") exception. If an exception is raised the error indicator is set and the function returns `-1`; otherwise the function returns `0`. The error indicator may or may not be cleared if it was previously set.
void `PyErr_SetInterrupt`()This function simulates the effect of a `SIGINT` signal arriving --- the next time [`PyErr_CheckSignals()`](#c.PyErr_CheckSignals "PyErr_CheckSignals") is called, [`KeyboardInterrupt`](../library/exceptions.xhtml#KeyboardInterrupt "KeyboardInterrupt") will be raised. It may be called without holding the interpreter lock.
int `PySignal_SetWakeupFd`(int *fd*)This utility function specifies a file descriptor to which the signal number is written as a single byte whenever a signal is received. *fd* must be non-blocking. It returns the previous such file descriptor.
The value `-1` disables the feature; this is the initial state. This is equivalent to [`signal.set_wakeup_fd()`](../library/signal.xhtml#signal.set_wakeup_fd "signal.set_wakeup_fd") in Python, but without any error checking. *fd* should be a valid file descriptor. The function should only be called from the main thread.
在 3.5 版更改: On Windows, the function now also supports socket handles.
## Exception Classes
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyErr_NewException`(const char *\*name*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*base*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*dict*)*Return value: New reference.*This utility function creates and returns a new exception class. The *name*argument must be the name of the new exception, a C string of the form `module.classname`. The *base* and *dict* arguments are normally *NULL*. This creates a class object derived from [`Exception`](../library/exceptions.xhtml#Exception "Exception") (accessible in C as `PyExc_Exception`).
The `__module__` attribute of the new class is set to the first part (up to the last dot) of the *name* argument, and the class name is set to the last part (after the last dot). The *base* argument can be used to specify alternate base classes; it can either be only one class or a tuple of classes. The *dict*argument can be used to specify a dictionary of class variables and methods.
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyErr_NewExceptionWithDoc`(const char *\*name*, const char *\*doc*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*base*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*dict*)*Return value: New reference.*Same as [`PyErr_NewException()`](#c.PyErr_NewException "PyErr_NewException"), except that the new exception class can easily be given a docstring: If *doc* is non-*NULL*, it will be used as the docstring for the exception class.
3\.2 新版功能.
## Exception Objects
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyException_GetTraceback`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*ex*)*Return value: New reference.*Return the traceback associated with the exception as a new reference, as accessible from Python through `__traceback__`. If there is no traceback associated, this returns *NULL*.
int `PyException_SetTraceback`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*ex*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*tb*)Set the traceback associated with the exception to *tb*. Use `Py_None` to clear it.
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyException_GetContext`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*ex*)*Return value: New reference.*Return the context (another exception instance during whose handling *ex* was raised) associated with the exception as a new reference, as accessible from Python through `__context__`. If there is no context associated, this returns *NULL*.
void `PyException_SetContext`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*ex*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*ctx*)Set the context associated with the exception to *ctx*. Use *NULL* to clear it. There is no type check to make sure that *ctx* is an exception instance. This steals a reference to *ctx*.
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyException_GetCause`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*ex*)*Return value: New reference.*Return the cause (either an exception instance, or [`None`](../library/constants.xhtml#None "None"), set by `raise ... from ...`) associated with the exception as a new reference, as accessible from Python through `__cause__`.
void `PyException_SetCause`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*ex*, [PyObject](structures.xhtml#c.PyObject "PyObject") *\*cause*)Set the cause associated with the exception to *cause*. Use *NULL* to clear it. There is no type check to make sure that *cause* is either an exception instance or [`None`](../library/constants.xhtml#None "None"). This steals a reference to *cause*.
`__suppress_context__` is implicitly set to `True` by this function.
## Unicode Exception Objects
The following functions are used to create and modify Unicode exceptions from C.
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyUnicodeDecodeError_Create`(const char *\*encoding*, const char *\*object*, Py\_ssize\_t *length*, Py\_ssize\_t *start*, Py\_ssize\_t *end*, const char *\*reason*)*Return value: New reference.*Create a [`UnicodeDecodeError`](../library/exceptions.xhtml#UnicodeDecodeError "UnicodeDecodeError") object with the attributes *encoding*, *object*, *length*, *start*, *end* and *reason*. *encoding* and *reason* are UTF-8 encoded strings.
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyUnicodeEncodeError_Create`(const char *\*encoding*, const [Py\_UNICODE](unicode.xhtml#c.Py_UNICODE "Py_UNICODE") *\*object*, Py\_ssize\_t *length*, Py\_ssize\_t *start*, Py\_ssize\_t *end*, const char *\*reason*)*Return value: New reference.*Create a [`UnicodeEncodeError`](../library/exceptions.xhtml#UnicodeEncodeError "UnicodeEncodeError") object with the attributes *encoding*, *object*, *length*, *start*, *end* and *reason*. *encoding* and *reason* are UTF-8 encoded strings.
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyUnicodeTranslateError_Create`(const [Py\_UNICODE](unicode.xhtml#c.Py_UNICODE "Py_UNICODE") *\*object*, Py\_ssize\_t *length*, Py\_ssize\_t *start*, Py\_ssize\_t *end*, const char *\*reason*)*Return value: New reference.*Create a [`UnicodeTranslateError`](../library/exceptions.xhtml#UnicodeTranslateError "UnicodeTranslateError") object with the attributes *object*, *length*, *start*, *end* and *reason*. *reason* is a UTF-8 encoded string.
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyUnicodeDecodeError_GetEncoding`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*)[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyUnicodeEncodeError_GetEncoding`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*)*Return value: New reference.*Return the *encoding* attribute of the given exception object.
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyUnicodeDecodeError_GetObject`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*)[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyUnicodeEncodeError_GetObject`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*)[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyUnicodeTranslateError_GetObject`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*)*Return value: New reference.*Return the *object* attribute of the given exception object.
int `PyUnicodeDecodeError_GetStart`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*, Py\_ssize\_t *\*start*)int `PyUnicodeEncodeError_GetStart`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*, Py\_ssize\_t *\*start*)int `PyUnicodeTranslateError_GetStart`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*, Py\_ssize\_t *\*start*)Get the *start* attribute of the given exception object and place it into *\*start*. *start* must not be *NULL*. Return `0` on success, `-1` on failure.
int `PyUnicodeDecodeError_SetStart`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*, Py\_ssize\_t *start*)int `PyUnicodeEncodeError_SetStart`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*, Py\_ssize\_t *start*)int `PyUnicodeTranslateError_SetStart`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*, Py\_ssize\_t *start*)Set the *start* attribute of the given exception object to *start*. Return `0` on success, `-1` on failure.
int `PyUnicodeDecodeError_GetEnd`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*, Py\_ssize\_t *\*end*)int `PyUnicodeEncodeError_GetEnd`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*, Py\_ssize\_t *\*end*)int `PyUnicodeTranslateError_GetEnd`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*, Py\_ssize\_t *\*end*)Get the *end* attribute of the given exception object and place it into *\*end*. *end* must not be *NULL*. Return `0` on success, `-1` on failure.
int `PyUnicodeDecodeError_SetEnd`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*, Py\_ssize\_t *end*)int `PyUnicodeEncodeError_SetEnd`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*, Py\_ssize\_t *end*)int `PyUnicodeTranslateError_SetEnd`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*, Py\_ssize\_t *end*)Set the *end* attribute of the given exception object to *end*. Return `0`on success, `-1` on failure.
[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyUnicodeDecodeError_GetReason`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*)[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyUnicodeEncodeError_GetReason`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*)[PyObject](structures.xhtml#c.PyObject "PyObject")\* `PyUnicodeTranslateError_GetReason`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*)*Return value: New reference.*Return the *reason* attribute of the given exception object.
int `PyUnicodeDecodeError_SetReason`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*, const char *\*reason*)int `PyUnicodeEncodeError_SetReason`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*, const char *\*reason*)int `PyUnicodeTranslateError_SetReason`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*exc*, const char *\*reason*)Set the *reason* attribute of the given exception object to *reason*. Return `0` on success, `-1` on failure.
## Recursion Control
These two functions provide a way to perform safe recursive calls at the C level, both in the core and in extension modules. They are needed if the recursive code does not necessarily invoke Python code (which tracks its recursion depth automatically).
int `Py_EnterRecursiveCall`(const char *\*where*)Marks a point where a recursive C-level call is about to be performed.
If `USE_STACKCHECK` is defined, this function checks if the OS stack overflowed using [`PyOS_CheckStack()`](sys.xhtml#c.PyOS_CheckStack "PyOS_CheckStack"). In this is the case, it sets a [`MemoryError`](../library/exceptions.xhtml#MemoryError "MemoryError") and returns a nonzero value.
The function then checks if the recursion limit is reached. If this is the case, a [`RecursionError`](../library/exceptions.xhtml#RecursionError "RecursionError") is set and a nonzero value is returned. Otherwise, zero is returned.
*where* should be a string such as `" in instance check"` to be concatenated to the [`RecursionError`](../library/exceptions.xhtml#RecursionError "RecursionError") message caused by the recursion depth limit.
void `Py_LeaveRecursiveCall`()Ends a [`Py_EnterRecursiveCall()`](#c.Py_EnterRecursiveCall "Py_EnterRecursiveCall"). Must be called once for each *successful* invocation of [`Py_EnterRecursiveCall()`](#c.Py_EnterRecursiveCall "Py_EnterRecursiveCall").
Properly implementing [`tp_repr`](typeobj.xhtml#c.PyTypeObject.tp_repr "PyTypeObject.tp_repr") for container types requires special recursion handling. In addition to protecting the stack, [`tp_repr`](typeobj.xhtml#c.PyTypeObject.tp_repr "PyTypeObject.tp_repr") also needs to track objects to prevent cycles. The following two functions facilitate this functionality. Effectively, these are the C equivalent to [`reprlib.recursive_repr()`](../library/reprlib.xhtml#reprlib.recursive_repr "reprlib.recursive_repr").
int `Py_ReprEnter`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*object*)Called at the beginning of the [`tp_repr`](typeobj.xhtml#c.PyTypeObject.tp_repr "PyTypeObject.tp_repr") implementation to detect cycles.
If the object has already been processed, the function returns a positive integer. In that case the [`tp_repr`](typeobj.xhtml#c.PyTypeObject.tp_repr "PyTypeObject.tp_repr") implementation should return a string object indicating a cycle. As examples, [`dict`](../library/stdtypes.xhtml#dict "dict") objects return `{...}` and [`list`](../library/stdtypes.xhtml#list "list") objects return `[...]`.
The function will return a negative integer if the recursion limit is reached. In that case the [`tp_repr`](typeobj.xhtml#c.PyTypeObject.tp_repr "PyTypeObject.tp_repr") implementation should typically return `NULL`.
Otherwise, the function returns zero and the [`tp_repr`](typeobj.xhtml#c.PyTypeObject.tp_repr "PyTypeObject.tp_repr")implementation can continue normally.
void `Py_ReprLeave`([PyObject](structures.xhtml#c.PyObject "PyObject") *\*object*)Ends a [`Py_ReprEnter()`](#c.Py_ReprEnter "Py_ReprEnter"). Must be called once for each invocation of [`Py_ReprEnter()`](#c.Py_ReprEnter "Py_ReprEnter") that returns zero.
## 标准异常
All standard Python exceptions are available as global variables whose names are `PyExc_` followed by the Python exception name. These have the type [`PyObject*`](structures.xhtml#c.PyObject "PyObject"); they are all class objects. For completeness, here are all the variables:
C 名称
Python 名称
注释
`PyExc_BaseException`
[`BaseException`](../library/exceptions.xhtml#BaseException "BaseException")
(1)
`PyExc_Exception`
[`Exception`](../library/exceptions.xhtml#Exception "Exception")
(1)
`PyExc_ArithmeticError`
[`ArithmeticError`](../library/exceptions.xhtml#ArithmeticError "ArithmeticError")
(1)
`PyExc_AssertionError`
[`AssertionError`](../library/exceptions.xhtml#AssertionError "AssertionError")
`PyExc_AttributeError`
[`AttributeError`](../library/exceptions.xhtml#AttributeError "AttributeError")
`PyExc_BlockingIOError`
[`BlockingIOError`](../library/exceptions.xhtml#BlockingIOError "BlockingIOError")
`PyExc_BrokenPipeError`
[`BrokenPipeError`](../library/exceptions.xhtml#BrokenPipeError "BrokenPipeError")
`PyExc_BufferError`
[`BufferError`](../library/exceptions.xhtml#BufferError "BufferError")
`PyExc_ChildProcessError`
[`ChildProcessError`](../library/exceptions.xhtml#ChildProcessError "ChildProcessError")
`PyExc_ConnectionAbortedError`
[`ConnectionAbortedError`](../library/exceptions.xhtml#ConnectionAbortedError "ConnectionAbortedError")
`PyExc_ConnectionError`
[`ConnectionError`](../library/exceptions.xhtml#ConnectionError "ConnectionError")
`PyExc_ConnectionRefusedError`
[`ConnectionRefusedError`](../library/exceptions.xhtml#ConnectionRefusedError "ConnectionRefusedError")
`PyExc_ConnectionResetError`
[`ConnectionResetError`](../library/exceptions.xhtml#ConnectionResetError "ConnectionResetError")
`PyExc_EOFError`
[`EOFError`](../library/exceptions.xhtml#EOFError "EOFError")
`PyExc_FileExistsError`
[`FileExistsError`](../library/exceptions.xhtml#FileExistsError "FileExistsError")
`PyExc_FileNotFoundError`
[`FileNotFoundError`](../library/exceptions.xhtml#FileNotFoundError "FileNotFoundError")
`PyExc_FloatingPointError`
[`FloatingPointError`](../library/exceptions.xhtml#FloatingPointError "FloatingPointError")
`PyExc_GeneratorExit`
[`GeneratorExit`](../library/exceptions.xhtml#GeneratorExit "GeneratorExit")
`PyExc_ImportError`
[`ImportError`](../library/exceptions.xhtml#ImportError "ImportError")
`PyExc_IndentationError`
[`IndentationError`](../library/exceptions.xhtml#IndentationError "IndentationError")
`PyExc_IndexError`
[`IndexError`](../library/exceptions.xhtml#IndexError "IndexError")
`PyExc_InterruptedError`
[`InterruptedError`](../library/exceptions.xhtml#InterruptedError "InterruptedError")
`PyExc_IsADirectoryError`
[`IsADirectoryError`](../library/exceptions.xhtml#IsADirectoryError "IsADirectoryError")
`PyExc_KeyError`
[`KeyError`](../library/exceptions.xhtml#KeyError "KeyError")
`PyExc_KeyboardInterrupt`
[`KeyboardInterrupt`](../library/exceptions.xhtml#KeyboardInterrupt "KeyboardInterrupt")
`PyExc_LookupError`
[`LookupError`](../library/exceptions.xhtml#LookupError "LookupError")
(1)
`PyExc_MemoryError`
[`MemoryError`](../library/exceptions.xhtml#MemoryError "MemoryError")
`PyExc_ModuleNotFoundError`
[`ModuleNotFoundError`](../library/exceptions.xhtml#ModuleNotFoundError "ModuleNotFoundError")
`PyExc_NameError`
[`NameError`](../library/exceptions.xhtml#NameError "NameError")
`PyExc_NotADirectoryError`
[`NotADirectoryError`](../library/exceptions.xhtml#NotADirectoryError "NotADirectoryError")
`PyExc_NotImplementedError`
[`NotImplementedError`](../library/exceptions.xhtml#NotImplementedError "NotImplementedError")
`PyExc_OSError`
[`OSError`](../library/exceptions.xhtml#OSError "OSError")
(1)
`PyExc_OverflowError`
[`OverflowError`](../library/exceptions.xhtml#OverflowError "OverflowError")
`PyExc_PermissionError`
[`PermissionError`](../library/exceptions.xhtml#PermissionError "PermissionError")
`PyExc_ProcessLookupError`
[`ProcessLookupError`](../library/exceptions.xhtml#ProcessLookupError "ProcessLookupError")
`PyExc_RecursionError`
[`RecursionError`](../library/exceptions.xhtml#RecursionError "RecursionError")
`PyExc_ReferenceError`
[`ReferenceError`](../library/exceptions.xhtml#ReferenceError "ReferenceError")
(2)
`PyExc_RuntimeError`
[`RuntimeError`](../library/exceptions.xhtml#RuntimeError "RuntimeError")
`PyExc_StopAsyncIteration`
[`StopAsyncIteration`](../library/exceptions.xhtml#StopAsyncIteration "StopAsyncIteration")
`PyExc_StopIteration`
[`StopIteration`](../library/exceptions.xhtml#StopIteration "StopIteration")
`PyExc_SyntaxError`
[`SyntaxError`](../library/exceptions.xhtml#SyntaxError "SyntaxError")
`PyExc_SystemError`
[`SystemError`](../library/exceptions.xhtml#SystemError "SystemError")
`PyExc_SystemExit`
[`SystemExit`](../library/exceptions.xhtml#SystemExit "SystemExit")
`PyExc_TabError`
[`TabError`](../library/exceptions.xhtml#TabError "TabError")
`PyExc_TimeoutError`
[`TimeoutError`](../library/exceptions.xhtml#TimeoutError "TimeoutError")
`PyExc_TypeError`
[`TypeError`](../library/exceptions.xhtml#TypeError "TypeError")
`PyExc_UnboundLocalError`
[`UnboundLocalError`](../library/exceptions.xhtml#UnboundLocalError "UnboundLocalError")
`PyExc_UnicodeDecodeError`
[`UnicodeDecodeError`](../library/exceptions.xhtml#UnicodeDecodeError "UnicodeDecodeError")
`PyExc_UnicodeEncodeError`
[`UnicodeEncodeError`](../library/exceptions.xhtml#UnicodeEncodeError "UnicodeEncodeError")
`PyExc_UnicodeError`
[`UnicodeError`](../library/exceptions.xhtml#UnicodeError "UnicodeError")
`PyExc_UnicodeTranslateError`
[`UnicodeTranslateError`](../library/exceptions.xhtml#UnicodeTranslateError "UnicodeTranslateError")
`PyExc_ValueError`
[`ValueError`](../library/exceptions.xhtml#ValueError "ValueError")
`PyExc_ZeroDivisionError`
[`ZeroDivisionError`](../library/exceptions.xhtml#ZeroDivisionError "ZeroDivisionError")
3\.3 新版功能: `PyExc_BlockingIOError`, `PyExc_BrokenPipeError`, `PyExc_ChildProcessError`, `PyExc_ConnectionError`, `PyExc_ConnectionAbortedError`, `PyExc_ConnectionRefusedError`, `PyExc_ConnectionResetError`, `PyExc_FileExistsError`, `PyExc_FileNotFoundError`, `PyExc_InterruptedError`, `PyExc_IsADirectoryError`, `PyExc_NotADirectoryError`, `PyExc_PermissionError`, `PyExc_ProcessLookupError` and `PyExc_TimeoutError` 介绍如下 [**PEP 3151**](https://www.python.org/dev/peps/pep-3151) \[https://www.python.org/dev/peps/pep-3151\].
3\.5 新版功能: `PyExc_StopAsyncIteration` 和 `PyExc_RecursionError`.
3\.6 新版功能: `PyExc_ModuleNotFoundError`.
这些是兼容性别名 `PyExc_OSError`:
C 名称
注释
`PyExc_EnvironmentError`
`PyExc_IOError`
`PyExc_WindowsError`
(3)
在 3.3 版更改: 这些别名曾经是单独的异常类型。
注释:
1. 这是其他标准异常的基类。
2. 这与 [`weakref.ReferenceError`](../library/weakref.xhtml#weakref.ReferenceError "weakref.ReferenceError") 相同。
3. Only defined on Windows; protect code that uses this by testing that the preprocessor macro `MS_WINDOWS` is defined.
## 标准警告类别
All standard Python warning categories are available as global variables whose names are `PyExc_` followed by the Python exception name. These have the type [`PyObject*`](structures.xhtml#c.PyObject "PyObject"); they are all class objects. For completeness, here are all the variables:
C 名称
Python 名称
注释
`PyExc_Warning`
[`Warning`](../library/exceptions.xhtml#Warning "Warning")
(1)
`PyExc_BytesWarning`
[`BytesWarning`](../library/exceptions.xhtml#BytesWarning "BytesWarning")
`PyExc_DeprecationWarning`
[`DeprecationWarning`](../library/exceptions.xhtml#DeprecationWarning "DeprecationWarning")
`PyExc_FutureWarning`
[`FutureWarning`](../library/exceptions.xhtml#FutureWarning "FutureWarning")
`PyExc_ImportWarning`
[`ImportWarning`](../library/exceptions.xhtml#ImportWarning "ImportWarning")
`PyExc_PendingDeprecationWarning`
[`PendingDeprecationWarning`](../library/exceptions.xhtml#PendingDeprecationWarning "PendingDeprecationWarning")
`PyExc_ResourceWarning`
[`ResourceWarning`](../library/exceptions.xhtml#ResourceWarning "ResourceWarning")
`PyExc_RuntimeWarning`
[`RuntimeWarning`](../library/exceptions.xhtml#RuntimeWarning "RuntimeWarning")
`PyExc_SyntaxWarning`
[`SyntaxWarning`](../library/exceptions.xhtml#SyntaxWarning "SyntaxWarning")
`PyExc_UnicodeWarning`
[`UnicodeWarning`](../library/exceptions.xhtml#UnicodeWarning "UnicodeWarning")
`PyExc_UserWarning`
[`UserWarning`](../library/exceptions.xhtml#UserWarning "UserWarning")
3\.2 新版功能: `PyExc_ResourceWarning`.
注释:
1. 这是其他标准警告类别的基类。
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- Python文档内容
- Python 有什么新变化？
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- 摘要 - 发布重点
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- 摘要 - 发布重点
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- 弃用
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- Porting to Python 3.4
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- What's New In Python 3.3
- 摘要 - 发布重点
- PEP 405: Virtual Environments
- PEP 420: Implicit Namespace Packages
- PEP 3118: New memoryview implementation and buffer protocol documentation
- PEP 393: Flexible String Representation
- PEP 397: Python Launcher for Windows
- PEP 3151: Reworking the OS and IO exception hierarchy
- PEP 380: Syntax for Delegating to a Subgenerator
- PEP 409: Suppressing exception context
- PEP 414: Explicit Unicode literals
- PEP 3155: Qualified name for classes and functions
- PEP 412: Key-Sharing Dictionary
- PEP 362: Function Signature Object
- PEP 421: Adding sys.implementation
- Using importlib as the Implementation of Import
- 其他语言特性修改
- A Finer-Grained Import Lock
- Builtin functions and types
- 新增模块
- 改进的模块
- 性能优化
- Build and C API Changes
- 弃用
- Porting to Python 3.3
- What's New In Python 3.2
- PEP 384: Defining a Stable ABI
- PEP 389: Argparse Command Line Parsing Module
- PEP 391: Dictionary Based Configuration for Logging
- PEP 3148: The concurrent.futures module
- PEP 3147: PYC Repository Directories
- PEP 3149: ABI Version Tagged .so Files
- PEP 3333: Python Web Server Gateway Interface v1.0.1
- 其他语言特性修改
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- IDLE
- Code Repository
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- PEP 372: Ordered Dictionaries
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- 其他语言特性修改
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- Miscellaneous Other Changes
- Build and C API Changes
- 性能
- Porting To Python 3.0
- What's New in Python 2.7
- The Future for Python 2.x
- Changes to the Handling of Deprecation Warnings
- Python 3.1 Features
- PEP 372: Adding an Ordered Dictionary to collections
- PEP 378: Format Specifier for Thousands Separator
- PEP 389: The argparse Module for Parsing Command Lines
- PEP 391: Dictionary-Based Configuration For Logging
- PEP 3106: Dictionary Views
- PEP 3137: The memoryview Object
- 其他语言特性修改
- New and Improved Modules
- Build and C API Changes
- Other Changes and Fixes
- Porting to Python 2.7
- New Features Added to Python 2.7 Maintenance Releases
- Acknowledgements
- Python 2.6 有什么新变化
- Python 3.0
- Changes to the Development Process
- PEP 343: The 'with' statement
- PEP 366: Explicit Relative Imports From a Main Module
- PEP 370: Per-user site-packages Directory
- PEP 371: The multiprocessing Package
- PEP 3101: Advanced String Formatting
- PEP 3105: print As a Function
- PEP 3110: Exception-Handling Changes
- PEP 3112: Byte Literals
- PEP 3116: New I/O Library
- PEP 3118: Revised Buffer Protocol
- PEP 3119: Abstract Base Classes
- PEP 3127: Integer Literal Support and Syntax
- PEP 3129: Class Decorators
- PEP 3141: A Type Hierarchy for Numbers
- 其他语言特性修改
- New and Improved Modules
- Deprecations and Removals
- Build and C API Changes
- Porting to Python 2.6
- Acknowledgements
- What's New in Python 2.5
- PEP 308: Conditional Expressions
- PEP 309: Partial Function Application
- PEP 314: Metadata for Python Software Packages v1.1
- PEP 328: Absolute and Relative Imports
- PEP 338: Executing Modules as Scripts
- PEP 341: Unified try/except/finally
- PEP 342: New Generator Features
- PEP 343: The 'with' statement
- PEP 352: Exceptions as New-Style Classes
- PEP 353: Using ssize_t as the index type
- PEP 357: The 'index' method
- 其他语言特性修改
- New, Improved, and Removed Modules
- Build and C API Changes
- Porting to Python 2.5
- Acknowledgements
- What's New in Python 2.4
- PEP 218: Built-In Set Objects
- PEP 237: Unifying Long Integers and Integers
- PEP 289: Generator Expressions
- PEP 292: Simpler String Substitutions
- PEP 318: Decorators for Functions and Methods
- PEP 322: Reverse Iteration
- PEP 324: New subprocess Module
- PEP 327: Decimal Data Type
- PEP 328: Multi-line Imports
- PEP 331: Locale-Independent Float/String Conversions
- 其他语言特性修改
- New, Improved, and Deprecated Modules
- Build and C API Changes
- Porting to Python 2.4
- Acknowledgements
- What's New in Python 2.3
- PEP 218: A Standard Set Datatype
- PEP 255: Simple Generators
- PEP 263: Source Code Encodings
- PEP 273: Importing Modules from ZIP Archives
- PEP 277: Unicode file name support for Windows NT
- PEP 278: Universal Newline Support
- PEP 279: enumerate()
- PEP 282: The logging Package
- PEP 285: A Boolean Type
- PEP 293: Codec Error Handling Callbacks
- PEP 301: Package Index and Metadata for Distutils
- PEP 302: New Import Hooks
- PEP 305: Comma-separated Files
- PEP 307: Pickle Enhancements
- Extended Slices
- 其他语言特性修改
- New, Improved, and Deprecated Modules
- Pymalloc: A Specialized Object Allocator
- Build and C API Changes
- Other Changes and Fixes
- Porting to Python 2.3
- Acknowledgements
- What's New in Python 2.2
- 概述
- PEPs 252 and 253: Type and Class Changes
- PEP 234: Iterators
- PEP 255: Simple Generators
- PEP 237: Unifying Long Integers and Integers
- PEP 238: Changing the Division Operator
- Unicode Changes
- PEP 227: Nested Scopes
- New and Improved Modules
- Interpreter Changes and Fixes
- Other Changes and Fixes
- Acknowledgements
- What's New in Python 2.1
- 概述
- PEP 227: Nested Scopes
- PEP 236: future Directives
- PEP 207: Rich Comparisons
- PEP 230: Warning Framework
- PEP 229: New Build System
- PEP 205: Weak References
- PEP 232: Function Attributes
- PEP 235: Importing Modules on Case-Insensitive Platforms
- PEP 217: Interactive Display Hook
- PEP 208: New Coercion Model
- PEP 241: Metadata in Python Packages
- New and Improved Modules
- Other Changes and Fixes
- Acknowledgements
- What's New in Python 2.0
- 概述
- What About Python 1.6?
- New Development Process
- Unicode
- 列表推导式
- Augmented Assignment
- 字符串的方法
- Garbage Collection of Cycles
- Other Core Changes
- Porting to 2.0
- Extending/Embedding Changes
- Distutils: Making Modules Easy to Install
- XML Modules
- Module changes
- New modules
- IDLE Improvements
- Deleted and Deprecated Modules
- Acknowledgements
- 更新日志
- Python 下一版
- Python 3.7.3 最终版
- Python 3.7.3 发布候选版 1
- Python 3.7.2 最终版
- Python 3.7.2 发布候选版 1
- Python 3.7.1 最终版
- Python 3.7.1 RC 2版本
- Python 3.7.1 发布候选版 1
- Python 3.7.0 正式版
- Python 3.7.0 release candidate 1
- Python 3.7.0 beta 5
- Python 3.7.0 beta 4
- Python 3.7.0 beta 3
- Python 3.7.0 beta 2
- Python 3.7.0 beta 1
- Python 3.7.0 alpha 4
- Python 3.7.0 alpha 3
- Python 3.7.0 alpha 2
- Python 3.7.0 alpha 1
- Python 3.6.6 final
- Python 3.6.6 RC 1
- Python 3.6.5 final
- Python 3.6.5 release candidate 1
- Python 3.6.4 final
- Python 3.6.4 release candidate 1
- Python 3.6.3 final
- Python 3.6.3 release candidate 1
- Python 3.6.2 final
- Python 3.6.2 release candidate 2
- Python 3.6.2 release candidate 1
- Python 3.6.1 final
- Python 3.6.1 release candidate 1
- Python 3.6.0 final
- Python 3.6.0 release candidate 2
- Python 3.6.0 release candidate 1
- Python 3.6.0 beta 4
- Python 3.6.0 beta 3
- Python 3.6.0 beta 2
- Python 3.6.0 beta 1
- Python 3.6.0 alpha 4
- Python 3.6.0 alpha 3
- Python 3.6.0 alpha 2
- Python 3.6.0 alpha 1
- Python 3.5.5 final
- Python 3.5.5 release candidate 1
- Python 3.5.4 final
- Python 3.5.4 release candidate 1
- Python 3.5.3 final
- Python 3.5.3 release candidate 1
- Python 3.5.2 final
- Python 3.5.2 release candidate 1
- Python 3.5.1 final
- Python 3.5.1 release candidate 1
- Python 3.5.0 final
- Python 3.5.0 release candidate 4
- Python 3.5.0 release candidate 3
- Python 3.5.0 release candidate 2
- Python 3.5.0 release candidate 1
- Python 3.5.0 beta 4
- Python 3.5.0 beta 3
- Python 3.5.0 beta 2
- Python 3.5.0 beta 1
- Python 3.5.0 alpha 4
- Python 3.5.0 alpha 3
- Python 3.5.0 alpha 2
- Python 3.5.0 alpha 1
- Python 教程
- 课前甜点
- 使用 Python 解释器
- 调用解释器
- 解释器的运行环境
- Python 的非正式介绍
- Python 作为计算器使用
- 走向编程的第一步
- 其他流程控制工具
- if 语句
- for 语句
- range() 函数
- break 和 continue 语句，以及循环中的 else 子句
- pass 语句
- 定义函数
- 函数定义的更多形式
- 小插曲：编码风格
- 数据结构
- 列表的更多特性
- del 语句
- 元组和序列
- 集合
- 字典
- 循环的技巧
- 深入条件控制
- 序列和其它类型的比较
- 模块
- 有关模块的更多信息
- 标准模块
- dir() 函数
- 包
- 输入输出
- 更漂亮的输出格式
- 读写文件
- 错误和异常
- 语法错误
- 异常
- 处理异常
- 抛出异常
- 用户自定义异常
- 定义清理操作
- 预定义的清理操作
- 类
- 名称和对象
- Python 作用域和命名空间
- 初探类
- 补充说明
- 继承
- 私有变量
- 杂项说明
- 迭代器
- 生成器
- 生成器表达式
- 标准库简介
- 操作系统接口
- 文件通配符
- 命令行参数
- 错误输出重定向和程序终止
- 字符串模式匹配
- 数学
- 互联网访问
- 日期和时间
- 数据压缩
- 性能测量
- 质量控制
- 自带电池
- 标准库简介 —— 第二部分
- 格式化输出
- 模板
- 使用二进制数据记录格式
- 多线程
- 日志
- 弱引用
- 用于操作列表的工具
- 十进制浮点运算
- 虚拟环境和包
- 概述
- 创建虚拟环境
- 使用pip管理包
- 接下来？
- 交互式编辑和编辑历史
- Tab 补全和编辑历史
- 默认交互式解释器的替代品
- 浮点算术：争议和限制
- 表示性错误
- 附录
- 交互模式
- 安装和使用 Python
- 命令行与环境
- 命令行
- 环境变量
- 在Unix平台中使用Python
- 获取最新版本的Python
- 构建Python
- 与Python相关的路径和文件
- 杂项
- 编辑器和集成开发环境
- 在Windows上使用 Python
- 完整安装程序
- Microsoft Store包
- nuget.org 安装包
- 可嵌入的包
- 替代捆绑包
- 配置Python
- 适用于Windows的Python启动器
- 查找模块
- 附加模块
- 在Windows上编译Python
- 其他平台
- 在苹果系统上使用 Python
- 获取和安装 MacPython
- IDE
- 安装额外的 Python 包
- Mac 上的图形界面编程
- 在 Mac 上分发 Python 应用程序
- 其他资源
- Python 语言参考
- 概述
- 其他实现
- 标注
- 词法分析
- 行结构
- 其他形符
- 标识符和关键字
- 字面值
- 运算符
- 分隔符
- 数据模型
- 对象、值与类型
- 标准类型层级结构
- 特殊方法名称
- 协程
- 执行模型
- 程序的结构
- 命名与绑定
- 异常
- 导入系统
- importlib
- 包
- 搜索
- 加载
- 基于路径的查找器
- 替换标准导入系统
- Package Relative Imports
- 有关 main 的特殊事项
- 开放问题项
- 参考文献
- 表达式
- 算术转换
- 原子
- 原型
- await 表达式
- 幂运算符
- 一元算术和位运算
- 二元算术运算符
- 移位运算
- 二元位运算
- 比较运算
- 布尔运算
- 条件表达式
- lambda 表达式
- 表达式列表
- 求值顺序
- 运算符优先级
- 简单语句
- 表达式语句
- 赋值语句
- assert 语句
- pass 语句
- del 语句
- return 语句
- yield 语句
- raise 语句
- break 语句
- continue 语句
- import 语句
- global 语句
- nonlocal 语句
- 复合语句
- if 语句
- while 语句
- for 语句
- try 语句
- with 语句
- 函数定义
- 类定义
- 协程
- 最高层级组件
- 完整的 Python 程序
- 文件输入
- 交互式输入
- 表达式输入
- 完整的语法规范
- Python 标准库
- 概述
- 可用性注释
- 内置函数
- 内置常量
- 由 site 模块添加的常量
- 内置类型
- 逻辑值检测
- 布尔运算 — and, or, not
- 比较
- 数字类型 — int, float, complex
- 迭代器类型
- 序列类型 — list, tuple, range
- 文本序列类型 — str
- 二进制序列类型 — bytes, bytearray, memoryview
- 集合类型 — set, frozenset
- 映射类型 — dict
- 上下文管理器类型
- 其他内置类型
- 特殊属性
- 内置异常
- 基类
- 具体异常
- 警告
- 异常层次结构
- 文本处理服务
- string — 常见的字符串操作
- re — 正则表达式操作
- 模块 difflib 是一个计算差异的助手
- textwrap — Text wrapping and filling
- unicodedata — Unicode 数据库
- stringprep — Internet String Preparation
- readline — GNU readline interface
- rlcompleter — GNU readline的完成函数
- 二进制数据服务
- struct — Interpret bytes as packed binary data
- codecs — Codec registry and base classes
- 数据类型
- datetime — 基础日期/时间数据类型
- calendar — General calendar-related functions
- collections — 容器数据类型
- collections.abc — 容器的抽象基类
- heapq — 堆队列算法
- bisect — Array bisection algorithm
- array — Efficient arrays of numeric values
- weakref — 弱引用
- types — Dynamic type creation and names for built-in types
- copy — 浅层 (shallow) 和深层 (deep) 复制操作
- pprint — 数据美化输出
- reprlib — Alternate repr() implementation
- enum — Support for enumerations
- 数字和数学模块
- numbers — 数字的抽象基类
- math — 数学函数
- cmath — Mathematical functions for complex numbers
- decimal — 十进制定点和浮点运算
- fractions — 分数
- random — 生成伪随机数
- statistics — Mathematical statistics functions
- 函数式编程模块
- itertools — 为高效循环而创建迭代器的函数
- functools — 高阶函数和可调用对象上的操作
- operator — 标准运算符替代函数
- 文件和目录访问
- pathlib — 面向对象的文件系统路径
- os.path — 常见路径操作
- fileinput — Iterate over lines from multiple input streams
- stat — Interpreting stat() results
- filecmp — File and Directory Comparisons
- tempfile — Generate temporary files and directories
- glob — Unix style pathname pattern expansion
- fnmatch — Unix filename pattern matching
- linecache — Random access to text lines
- shutil — High-level file operations
- macpath — Mac OS 9 路径操作函数
- 数据持久化
- pickle —— Python 对象序列化
- copyreg — Register pickle support functions
- shelve — Python object persistence
- marshal — Internal Python object serialization
- dbm — Interfaces to Unix “databases”
- sqlite3 — SQLite 数据库 DB-API 2.0 接口模块
- 数据压缩和存档
- zlib — 与 gzip 兼容的压缩
- gzip — 对 gzip 格式的支持
- bz2 — 对 bzip2 压缩算法的支持
- lzma — 用 LZMA 算法压缩
- zipfile — 在 ZIP 归档中工作
- tarfile — Read and write tar archive files
- 文件格式
- csv — CSV 文件读写
- configparser — Configuration file parser
- netrc — netrc file processing
- xdrlib — Encode and decode XDR data
- plistlib — Generate and parse Mac OS X .plist files
- 加密服务
- hashlib — 安全哈希与消息摘要
- hmac — 基于密钥的消息验证
- secrets — Generate secure random numbers for managing secrets
- 通用操作系统服务
- os — 操作系统接口模块
- io — 处理流的核心工具
- time — 时间的访问和转换
- argparse — 命令行选项、参数和子命令解析器
- getopt — C-style parser for command line options
- 模块 logging — Python 的日志记录工具
- logging.config — 日志记录配置
- logging.handlers — Logging handlers
- getpass — 便携式密码输入工具
- curses — 终端字符单元显示的处理
- curses.textpad — Text input widget for curses programs
- curses.ascii — Utilities for ASCII characters
- curses.panel — A panel stack extension for curses
- platform — Access to underlying platform's identifying data
- errno — Standard errno system symbols
- ctypes — Python 的外部函数库
- 并发执行
- threading — 基于线程的并行
- multiprocessing — 基于进程的并行
- concurrent 包
- concurrent.futures — 启动并行任务
- subprocess — 子进程管理
- sched — 事件调度器
- queue — 一个同步的队列类
- _thread — 底层多线程 API
- _dummy_thread — _thread 的替代模块
- dummy_threading — 可直接替代 threading 模块。
- contextvars — Context Variables
- Context Variables
- Manual Context Management
- asyncio support
- 网络和进程间通信
- asyncio — 异步 I/O
- socket — 底层网络接口
- ssl — TLS/SSL wrapper for socket objects
- select — Waiting for I/O completion
- selectors — 高级 I/O 复用库
- asyncore — 异步socket处理器
- asynchat — 异步 socket 指令/响应 处理器
- signal — Set handlers for asynchronous events
- mmap — Memory-mapped file support
- 互联网数据处理
- email — 电子邮件与 MIME 处理包
- json — JSON 编码和解码器
- mailcap — Mailcap file handling
- mailbox — Manipulate mailboxes in various formats
- mimetypes — Map filenames to MIME types
- base64 — Base16, Base32, Base64, Base85 数据编码
- binhex — 对binhex4文件进行编码和解码
- binascii — 二进制和 ASCII 码互转
- quopri — Encode and decode MIME quoted-printable data
- uu — Encode and decode uuencode files
- 结构化标记处理工具
- html — 超文本标记语言支持
- html.parser — 简单的 HTML 和 XHTML 解析器
- html.entities — HTML 一般实体的定义
- XML处理模块
- xml.etree.ElementTree — The ElementTree XML API
- xml.dom — The Document Object Model API
- xml.dom.minidom — Minimal DOM implementation
- xml.dom.pulldom — Support for building partial DOM trees
- xml.sax — Support for SAX2 parsers
- xml.sax.handler — Base classes for SAX handlers
- xml.sax.saxutils — SAX Utilities
- xml.sax.xmlreader — Interface for XML parsers
- xml.parsers.expat — Fast XML parsing using Expat
- 互联网协议和支持
- webbrowser — 方便的Web浏览器控制器
- cgi — Common Gateway Interface support
- cgitb — Traceback manager for CGI scripts
- wsgiref — WSGI Utilities and Reference Implementation
- urllib — URL 处理模块
- urllib.request — 用于打开 URL 的可扩展库
- urllib.response — Response classes used by urllib
- urllib.parse — Parse URLs into components
- urllib.error — Exception classes raised by urllib.request
- urllib.robotparser — Parser for robots.txt
- http — HTTP 模块
- http.client — HTTP协议客户端
- ftplib — FTP protocol client
- poplib — POP3 protocol client
- imaplib — IMAP4 protocol client
- nntplib — NNTP protocol client
- smtplib —SMTP协议客户端
- smtpd — SMTP Server
- telnetlib — Telnet client
- uuid — UUID objects according to RFC 4122
- socketserver — A framework for network servers
- http.server — HTTP 服务器
- http.cookies — HTTP state management
- http.cookiejar — Cookie handling for HTTP clients
- xmlrpc — XMLRPC 服务端与客户端模块
- xmlrpc.client — XML-RPC client access
- xmlrpc.server — Basic XML-RPC servers
- ipaddress — IPv4/IPv6 manipulation library
- 多媒体服务
- audioop — Manipulate raw audio data
- aifc — Read and write AIFF and AIFC files
- sunau — 读写 Sun AU 文件
- wave — 读写WAV格式文件
- chunk — Read IFF chunked data
- colorsys — Conversions between color systems
- imghdr — 推测图像类型
- sndhdr — 推测声音文件的类型
- ossaudiodev — Access to OSS-compatible audio devices
- 国际化
- gettext — 多语种国际化服务
- locale — 国际化服务
- 程序框架
- turtle — 海龟绘图
- cmd — 支持面向行的命令解释器
- shlex — Simple lexical analysis
- Tk图形用户界面(GUI)
- tkinter — Tcl/Tk的Python接口
- tkinter.ttk — Tk themed widgets
- tkinter.tix — Extension widgets for Tk
- tkinter.scrolledtext — 滚动文字控件
- IDLE
- 其他图形用户界面（GUI）包
- 开发工具
- typing — 类型标注支持
- pydoc — Documentation generator and online help system
- doctest — Test interactive Python examples
- unittest — 单元测试框架
- unittest.mock — mock object library
- unittest.mock 上手指南
- 2to3 - 自动将 Python 2 代码转为 Python 3 代码
- test — Regression tests package for Python
- test.support — Utilities for the Python test suite
- test.support.script_helper — Utilities for the Python execution tests
- 调试和分析
- bdb — Debugger framework
- faulthandler — Dump the Python traceback
- pdb — The Python Debugger
- The Python Profilers
- timeit — 测量小代码片段的执行时间
- trace — Trace or track Python statement execution
- tracemalloc — Trace memory allocations
- 软件打包和分发
- distutils — 构建和安装 Python 模块
- ensurepip — Bootstrapping the pip installer
- venv — 创建虚拟环境
- zipapp — Manage executable Python zip archives
- Python运行时服务
- sys — 系统相关的参数和函数
- sysconfig — Provide access to Python's configuration information
- builtins — 内建对象
- main — 顶层脚本环境
- warnings — Warning control
- dataclasses — 数据类
- contextlib — Utilities for with-statement contexts
- abc — 抽象基类
- atexit — 退出处理器
- traceback — Print or retrieve a stack traceback
- future — Future 语句定义
- gc — 垃圾回收器接口
- inspect — 检查对象
- site — Site-specific configuration hook
- 自定义 Python 解释器
- code — Interpreter base classes
- codeop — Compile Python code
- 导入模块
- zipimport — Import modules from Zip archives
- pkgutil — Package extension utility
- modulefinder — 查找脚本使用的模块
- runpy — Locating and executing Python modules
- importlib — The implementation of import
- Python 语言服务
- parser — Access Python parse trees
- ast — 抽象语法树
- symtable — Access to the compiler's symbol tables
- symbol — 与 Python 解析树一起使用的常量
- token — 与Python解析树一起使用的常量
- keyword — 检验Python关键字
- tokenize — Tokenizer for Python source
- tabnanny — 模糊缩进检测
- pyclbr — Python class browser support
- py_compile — Compile Python source files
- compileall — Byte-compile Python libraries
- dis — Python 字节码反汇编器
- pickletools — Tools for pickle developers
- 杂项服务
- formatter — Generic output formatting
- Windows系统相关模块
- msilib — Read and write Microsoft Installer files
- msvcrt — Useful routines from the MS VC++ runtime
- winreg — Windows 注册表访问
- winsound — Sound-playing interface for Windows
- Unix 专有服务
- posix — The most common POSIX system calls
- pwd — 用户密码数据库
- spwd — The shadow password database
- grp — The group database
- crypt — Function to check Unix passwords
- termios — POSIX style tty control
- tty — 终端控制功能
- pty — Pseudo-terminal utilities
- fcntl — The fcntl and ioctl system calls
- pipes — Interface to shell pipelines
- resource — Resource usage information
- nis — Interface to Sun's NIS (Yellow Pages)
- Unix syslog 库例程
- 被取代的模块
- optparse — Parser for command line options
- imp — Access the import internals
- 未创建文档的模块
- 平台特定模块
- 扩展和嵌入 Python 解释器
- 推荐的第三方工具
- 不使用第三方工具创建扩展
- 使用 C 或 C++ 扩展 Python
- 自定义扩展类型：教程
- 定义扩展类型：已分类主题
- 构建C/C++扩展
- 在Windows平台编译C和C++扩展
- 在更大的应用程序中嵌入 CPython 运行时
- Embedding Python in Another Application
- Python/C API 参考手册
- 概述
- 代码标准
- 包含文件
- 有用的宏
- 对象、类型和引用计数
- 异常
- 嵌入Python
- 调试构建
- 稳定的应用程序二进制接口
- The Very High Level Layer
- Reference Counting
- 异常处理
- Printing and clearing
- 抛出异常
- Issuing warnings
- Querying the error indicator
- Signal Handling
- Exception Classes
- Exception Objects
- Unicode Exception Objects
- Recursion Control
- 标准异常
- 标准警告类别
- 工具
- 操作系统实用程序
- 系统功能
- 过程控制
- 导入模块
- Data marshalling support
- 语句解释及变量编译
- 字符串转换与格式化
- 反射
- 编解码器注册与支持功能
- 抽象对象层
- Object Protocol
- 数字协议
- Sequence Protocol
- Mapping Protocol
- 迭代器协议
- 缓冲协议
- Old Buffer Protocol
- 具体的对象层
- 基本对象
- 数值对象
- 序列对象
- 容器对象
- 函数对象
- 其他对象
- Initialization, Finalization, and Threads
- 在Python初始化之前
- 全局配置变量
- Initializing and finalizing the interpreter
- Process-wide parameters
- Thread State and the Global Interpreter Lock
- Sub-interpreter support
- Asynchronous Notifications
- Profiling and Tracing
- Advanced Debugger Support
- Thread Local Storage Support
- 内存管理
- 概述
- 原始内存接口
- Memory Interface
- 对象分配器
- 默认内存分配器
- Customize Memory Allocators
- The pymalloc allocator
- tracemalloc C API
- 示例
- 对象实现支持
- 在堆中分配对象
- Common Object Structures
- Type 对象
- Number Object Structures
- Mapping Object Structures
- Sequence Object Structures
- Buffer Object Structures
- Async Object Structures
- 使对象类型支持循环垃圾回收
- API 和 ABI 版本管理
- 分发 Python 模块
- 关键术语
- 开源许可与协作
- 安装工具
- 阅读指南
- 我该如何...？
- ...为我的项目选择一个名字？
- ...创建和分发二进制扩展？
- 安装 Python 模块
- 关键术语
- 基本使用
- 我应如何 ...？
- ... 在 Python 3.4 之前的 Python 版本中安装 pip ？
- ... 只为当前用户安装软件包？
- ... 安装科学计算类 Python 软件包？
- ... 使用并行安装的多个 Python 版本？
- 常见的安装问题
- 在 Linux 的系统 Python 版本上安装
- 未安装 pip
- 安装二进制编译扩展
- Python 常用指引
- 将 Python 2 代码迁移到 Python 3
- 简要说明
- 详情
- 将扩展模块移植到 Python 3
- 条件编译
- 对象API的更改
- 模块初始化和状态
- CObject 替换为 Capsule
- 其他选项
- Curses Programming with Python
- What is curses?
- Starting and ending a curses application
- Windows and Pads
- Displaying Text
- User Input
- For More Information
- 实现描述器
- 摘要
- 定义和简介
- 描述器协议
- 发起调用描述符
- 描述符示例
- Properties
- 函数和方法
- Static Methods and Class Methods
- 函数式编程指引
- 概述
- 迭代器
- 生成器表达式和列表推导式
- 生成器
- 内置函数
- itertools 模块
- The functools module
- Small functions and the lambda expression
- Revision History and Acknowledgements
- 引用文献
- 日志 HOWTO
- 日志基础教程
- 进阶日志教程
- 日志级别
- 有用的处理程序
- 记录日志中引发的异常
- 使用任意对象作为消息
- 优化
- 日志操作手册
- 在多个模块中使用日志
- 在多线程中使用日志
- 使用多个日志处理器和多种格式化
- 在多个地方记录日志
- 日志服务器配置示例
- 处理日志处理器的阻塞
- Sending and receiving logging events across a network
- Adding contextual information to your logging output
- Logging to a single file from multiple processes
- Using file rotation
- Use of alternative formatting styles
- Customizing LogRecord
- Subclassing QueueHandler - a ZeroMQ example
- Subclassing QueueListener - a ZeroMQ example
- An example dictionary-based configuration
- Using a rotator and namer to customize log rotation processing
- A more elaborate multiprocessing example
- Inserting a BOM into messages sent to a SysLogHandler
- Implementing structured logging
- Customizing handlers with dictConfig()
- Using particular formatting styles throughout your application
- Configuring filters with dictConfig()
- Customized exception formatting
- Speaking logging messages
- Buffering logging messages and outputting them conditionally
- Formatting times using UTC (GMT) via configuration
- Using a context manager for selective logging
- 正则表达式HOWTO
- 概述
- 简单模式
- 使用正则表达式
- 更多模式能力
- 修改字符串
- 常见问题
- 反馈
- 套接字编程指南
- 套接字
- 创建套接字
- 使用一个套接字
- 断开连接
- 非阻塞的套接字
- 排序指南
- 基本排序
- 关键函数
- Operator 模块函数
- 升序和降序
- 排序稳定性和排序复杂度
- 使用装饰-排序-去装饰的旧方法
- 使用 cmp 参数的旧方法
- 其它
- Unicode 指南
- Unicode 概述
- Python's Unicode Support
- Reading and Writing Unicode Data
- Acknowledgements
- 如何使用urllib包获取网络资源
- 概述
- Fetching URLs
- 处理异常
- info and geturl
- Openers and Handlers
- Basic Authentication
- Proxies
- Sockets and Layers
- 脚注
- Argparse 教程
- 概念
- 基础
- 位置参数介绍
- Introducing Optional arguments
- Combining Positional and Optional arguments
- Getting a little more advanced
- Conclusion
- ipaddress模块介绍
- 创建 Address/Network/Interface 对象
- 审查 Address/Network/Interface 对象
- Network 作为 Address 列表
- 比较
- 将IP地址与其他模块一起使用
- 实例创建失败时获取更多详细信息
- Argument Clinic How-To
- The Goals Of Argument Clinic
- Basic Concepts And Usage
- Converting Your First Function
- Advanced Topics
- 使用 DTrace 和 SystemTap 检测CPython
- Enabling the static markers
- Static DTrace probes
- Static SystemTap markers
- Available static markers
- SystemTap Tapsets
- 示例
- Python 常见问题
- Python常见问题
- 一般信息
- 现实世界中的 Python
- 编程常见问题
- 一般问题
- 核心语言
- 数字和字符串
- 性能
- 序列（元组/列表）
- 对象
- 模块
- 设计和历史常见问题
- 为什么Python使用缩进来分组语句？
- 为什么简单的算术运算得到奇怪的结果？
- 为什么浮点计算不准确？
- 为什么Python字符串是不可变的？
- 为什么必须在方法定义和调用中显式使用“self”？
- 为什么不能在表达式中赋值？
- 为什么Python对某些功能（例如list.index()）使用方法来实现，而其他功能（例如len(List)）使用函数实现？
- 为什么 join()是一个字符串方法而不是列表或元组方法？
- 异常有多快？
- 为什么Python中没有switch或case语句？
- 难道不能在解释器中模拟线程，而非得依赖特定于操作系统的线程实现吗？
- 为什么lambda表达式不能包含语句？
- 可以将Python编译为机器代码，C或其他语言吗？
- Python如何管理内存？
- 为什么CPython不使用更传统的垃圾回收方案？
- CPython退出时为什么不释放所有内存？
- 为什么有单独的元组和列表数据类型？
- 列表是如何在CPython中实现的？
- 字典是如何在CPython中实现的？
- 为什么字典key必须是不可变的？
- 为什么 list.sort() 没有返回排序列表？
- 如何在Python中指定和实施接口规范？
- 为什么没有goto？
- 为什么原始字符串（r-strings）不能以反斜杠结尾？
- 为什么Python没有属性赋值的“with”语句？
- 为什么 if/while/def/class语句需要冒号？
- 为什么Python在列表和元组的末尾允许使用逗号？
- 代码库和插件 FAQ
- 通用的代码库问题
- 通用任务
- 线程相关
- 输入输出
- 网络 / Internet 编程
- 数据库
- 数学和数字
- 扩展/嵌入常见问题
- 可以使用C语言中创建自己的函数吗？
- 可以使用C++语言中创建自己的函数吗？
- C很难写，有没有其他选择？
- 如何从C执行任意Python语句？
- 如何从C中评估任意Python表达式？
- 如何从Python对象中提取C的值？
- 如何使用Py_BuildValue()创建任意长度的元组？
- 如何从C调用对象的方法？
- 如何捕获PyErr_Print()（或打印到stdout / stderr的任何内容）的输出？
- 如何从C访问用Python编写的模块？
- 如何从Python接口到C ++对象？
- 我使用Setup文件添加了一个模块，为什么make失败了？
- 如何调试扩展？
- 我想在Linux系统上编译一个Python模块，但是缺少一些文件。为什么?
- 如何区分“输入不完整”和“输入无效”？
- 如何找到未定义的g++符号__builtin_new或__pure_virtual？
- 能否创建一个对象类，其中部分方法在C中实现，而其他方法在Python中实现（例如通过继承）？
- Python在Windows上的常见问题
- 我怎样在Windows下运行一个Python程序？
- 我怎么让 Python 脚本可执行？
- 为什么有时候 Python 程序会启动缓慢？
- 我怎样使用Python脚本制作可执行文件？
- *.pyd 文件和DLL文件相同吗？
- 我怎样将Python嵌入一个Windows程序？
- 如何让编辑器不要在我的 Python 源代码中插入 tab ？
- 如何在不阻塞的情况下检查按键？
- 图形用户界面（GUI）常见问题
- 图形界面常见问题
- Python 是否有平台无关的图形界面工具包？
- 有哪些Python的GUI工具是某个平台专用的？
- 有关Tkinter的问题
- “为什么我的电脑上安装了 Python ？”
- 什么是Python？
- 为什么我的电脑上安装了 Python ？
- 我能删除 Python 吗？
- 术语对照表
- 文档说明
- Python 文档贡献者
- 解决 Bug
- 文档错误
- 使用 Python 的错误追踪系统
- 开始为 Python 贡献您的知识
- 版权
- 历史和许可证
- 软件历史
- 访问Python或以其他方式使用Python的条款和条件
- Python 3.7.3 的 PSF 许可协议
- Python 2.0 的 BeOpen.com 许可协议
- Python 1.6.1 的 CNRI 许可协议
- Python 0.9.0 至 1.2 的 CWI 许可协议
- 集成软件的许可和认可
- Mersenne Twister
- 套接字
- Asynchronous socket services
- Cookie management
- Execution tracing
- UUencode and UUdecode functions
- XML Remote Procedure Calls
- test_epoll
- Select kqueue
- SipHash24
- strtod and dtoa
- OpenSSL
- expat
- libffi
- zlib
- cfuhash
- libmpdec