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# [`io`](#module-io "io: Core tools for working with streams.") --- 处理流的核心工具
**源代码:** [Lib/io.py](https://github.com/python/cpython/tree/3.7/Lib/io.py) \[https://github.com/python/cpython/tree/3.7/Lib/io.py\]
- - - - - -
## 概述
[`io`](#module-io "io: Core tools for working with streams.") 模块提供了 Python 用于处理各种 I/O 类型的主要工具。三种主要的 I/O类型分别为: *文本 I/O*, *二进制 I/O* 和 *原始 I/O*。这些是泛型类型，有很多种后端存储可以用在他们上面。一个隶属于任何这些类型的具体对象被称作 [file object](../glossary.xhtml#term-file-object)。 其他同类的术语还有 *流* 和 *类文件对象*。
独立于其类别，每个具体流对象也将具有各种功能：它可以是只读，只写或读写。它还可以允许任意随机访问（向前或向后寻找任何位置），或仅允许顺序访问（例如在套接字或管道的情况下）。
All streams are careful about the type of data you give to them. For example giving a [`str`](stdtypes.xhtml#str "str") object to the `write()` method of a binary stream will raise a [`TypeError`](exceptions.xhtml#TypeError "TypeError"). So will giving a [`bytes`](stdtypes.xhtml#bytes "bytes") object to the `write()` method of a text stream.
在 3.3 版更改: Operations that used to raise [`IOError`](exceptions.xhtml#IOError "IOError") now raise [`OSError`](exceptions.xhtml#OSError "OSError"), since [`IOError`](exceptions.xhtml#IOError "IOError") is now an alias of [`OSError`](exceptions.xhtml#OSError "OSError").
### Text I/O
Text I/O expects and produces [`str`](stdtypes.xhtml#str "str") objects. This means that whenever the backing store is natively made of bytes (such as in the case of a file), encoding and decoding of data is made transparently as well as optional translation of platform-specific newline characters.
The easiest way to create a text stream is with [`open()`](functions.xhtml#open "open"), optionally specifying an encoding:
```
f = open("myfile.txt", "r", encoding="utf-8")
```
In-memory text streams are also available as [`StringIO`](#io.StringIO "io.StringIO") objects:
```
f = io.StringIO("some initial text data")
```
The text stream API is described in detail in the documentation of [`TextIOBase`](#io.TextIOBase "io.TextIOBase").
### Binary I/O
Binary I/O (also called *buffered I/O*) expects [bytes-like objects](../glossary.xhtml#term-bytes-like-object) and produces [`bytes`](stdtypes.xhtml#bytes "bytes")objects. No encoding, decoding, or newline translation is performed. This category of streams can be used for all kinds of non-text data, and also when manual control over the handling of text data is desired.
The easiest way to create a binary stream is with [`open()`](functions.xhtml#open "open") with `'b'` in the mode string:
```
f = open("myfile.jpg", "rb")
```
In-memory binary streams are also available as [`BytesIO`](#io.BytesIO "io.BytesIO") objects:
```
f = io.BytesIO(b"some initial binary data: \x00\x01")
```
The binary stream API is described in detail in the docs of [`BufferedIOBase`](#io.BufferedIOBase "io.BufferedIOBase").
Other library modules may provide additional ways to create text or binary streams. See [`socket.socket.makefile()`](socket.xhtml#socket.socket.makefile "socket.socket.makefile") for example.
### Raw I/O
Raw I/O (also called *unbuffered I/O*) is generally used as a low-level building-block for binary and text streams; it is rarely useful to directly manipulate a raw stream from user code. Nevertheless, you can create a raw stream by opening a file in binary mode with buffering disabled:
```
f = open("myfile.jpg", "rb", buffering=0)
```
The raw stream API is described in detail in the docs of [`RawIOBase`](#io.RawIOBase "io.RawIOBase").
## High-level Module Interface
`io.``DEFAULT_BUFFER_SIZE`An int containing the default buffer size used by the module's buffered I/O classes. [`open()`](functions.xhtml#open "open") uses the file's blksize (as obtained by [`os.stat()`](os.xhtml#os.stat "os.stat")) if possible.
`io.``open`(*file*, *mode='r'*, *buffering=-1*, *encoding=None*, *errors=None*, *newline=None*, *closefd=True*, *opener=None*)This is an alias for the builtin [`open()`](functions.xhtml#open "open") function.
*exception* `io.``BlockingIOError`This is a compatibility alias for the builtin [`BlockingIOError`](exceptions.xhtml#BlockingIOError "BlockingIOError")exception.
*exception* `io.``UnsupportedOperation`An exception inheriting [`OSError`](exceptions.xhtml#OSError "OSError") and [`ValueError`](exceptions.xhtml#ValueError "ValueError") that is raised when an unsupported operation is called on a stream.
### In-memory streams
It is also possible to use a [`str`](stdtypes.xhtml#str "str") or [bytes-like object](../glossary.xhtml#term-bytes-like-object) as a file for both reading and writing. For strings [`StringIO`](#io.StringIO "io.StringIO") can be used like a file opened in text mode. [`BytesIO`](#io.BytesIO "io.BytesIO") can be used like a file opened in binary mode. Both provide full read-write capabilities with random access.
参见
[`sys`](sys.xhtml#module-sys "sys: Access system-specific parameters and functions.")contains the standard IO streams: [`sys.stdin`](sys.xhtml#sys.stdin "sys.stdin"), [`sys.stdout`](sys.xhtml#sys.stdout "sys.stdout"), and [`sys.stderr`](sys.xhtml#sys.stderr "sys.stderr").
## Class hierarchy
The implementation of I/O streams is organized as a hierarchy of classes. First [abstract base classes](../glossary.xhtml#term-abstract-base-class) (ABCs), which are used to specify the various categories of streams, then concrete classes providing the standard stream implementations.
> 注解
>
> The abstract base classes also provide default implementations of some methods in order to help implementation of concrete stream classes. For example, [`BufferedIOBase`](#io.BufferedIOBase "io.BufferedIOBase") provides unoptimized implementations of `readinto()` and [`readline()`](#io.IOBase.readline "io.IOBase.readline").
At the top of the I/O hierarchy is the abstract base class [`IOBase`](#io.IOBase "io.IOBase"). It defines the basic interface to a stream. Note, however, that there is no separation between reading and writing to streams; implementations are allowed to raise [`UnsupportedOperation`](#io.UnsupportedOperation "io.UnsupportedOperation") if they do not support a given operation.
The [`RawIOBase`](#io.RawIOBase "io.RawIOBase") ABC extends [`IOBase`](#io.IOBase "io.IOBase"). It deals with the reading and writing of bytes to a stream. [`FileIO`](#io.FileIO "io.FileIO") subclasses [`RawIOBase`](#io.RawIOBase "io.RawIOBase")to provide an interface to files in the machine's file system.
The [`BufferedIOBase`](#io.BufferedIOBase "io.BufferedIOBase") ABC deals with buffering on a raw byte stream ([`RawIOBase`](#io.RawIOBase "io.RawIOBase")). Its subclasses, [`BufferedWriter`](#io.BufferedWriter "io.BufferedWriter"), [`BufferedReader`](#io.BufferedReader "io.BufferedReader"), and [`BufferedRWPair`](#io.BufferedRWPair "io.BufferedRWPair") buffer streams that are readable, writable, and both readable and writable. [`BufferedRandom`](#io.BufferedRandom "io.BufferedRandom")provides a buffered interface to random access streams. Another [`BufferedIOBase`](#io.BufferedIOBase "io.BufferedIOBase") subclass, [`BytesIO`](#io.BytesIO "io.BytesIO"), is a stream of in-memory bytes.
The [`TextIOBase`](#io.TextIOBase "io.TextIOBase") ABC, another subclass of [`IOBase`](#io.IOBase "io.IOBase"), deals with streams whose bytes represent text, and handles encoding and decoding to and from strings. [`TextIOWrapper`](#io.TextIOWrapper "io.TextIOWrapper"), which extends it, is a buffered text interface to a buffered raw stream ([`BufferedIOBase`](#io.BufferedIOBase "io.BufferedIOBase")). Finally, [`StringIO`](#io.StringIO "io.StringIO") is an in-memory stream for text.
Argument names are not part of the specification, and only the arguments of [`open()`](functions.xhtml#open "open") are intended to be used as keyword arguments.
The following table summarizes the ABCs provided by the [`io`](#module-io "io: Core tools for working with streams.") module:
ABC
Inherits
Stub Methods
Mixin Methods and Properties
[`IOBase`](#io.IOBase "io.IOBase")
`fileno`, `seek`, 和 `truncate`
`close`, `closed`, `__enter__`, `__exit__`, `flush`, `isatty`, `__iter__`, `__next__`, `readable`, `readline`, `readlines`, `seekable`, `tell`, `writable`, 和 `writelines`
[`RawIOBase`](#io.RawIOBase "io.RawIOBase")
[`IOBase`](#io.IOBase "io.IOBase")
`readinto` 和 `write`
Inherited [`IOBase`](#io.IOBase "io.IOBase") methods, `read`, and `readall`
[`BufferedIOBase`](#io.BufferedIOBase "io.BufferedIOBase")
[`IOBase`](#io.IOBase "io.IOBase")
`detach`, `read`, `read1`, 和 `write`
Inherited [`IOBase`](#io.IOBase "io.IOBase") methods, `readinto`, and `readinto1`
[`TextIOBase`](#io.TextIOBase "io.TextIOBase")
[`IOBase`](#io.IOBase "io.IOBase")
`detach`, `read`, `readline`, 和 `write`
Inherited [`IOBase`](#io.IOBase "io.IOBase") methods, `encoding`, `errors`, and `newlines`
### I/O Base Classes
*class* `io.``IOBase`The abstract base class for all I/O classes, acting on streams of bytes. There is no public constructor.
This class provides empty abstract implementations for many methods that derived classes can override selectively; the default implementations represent a file that cannot be read, written or seeked.
Even though [`IOBase`](#io.IOBase "io.IOBase") does not declare `read()`or `write()` because their signatures will vary, implementations and clients should consider those methods part of the interface. Also, implementations may raise a [`ValueError`](exceptions.xhtml#ValueError "ValueError") (or [`UnsupportedOperation`](#io.UnsupportedOperation "io.UnsupportedOperation")) when operations they do not support are called.
The basic type used for binary data read from or written to a file is [`bytes`](stdtypes.xhtml#bytes "bytes"). Other [bytes-like objects](../glossary.xhtml#term-bytes-like-object) are accepted as method arguments too. Text I/O classes work with [`str`](stdtypes.xhtml#str "str") data.
Note that calling any method (even inquiries) on a closed stream is undefined. Implementations may raise [`ValueError`](exceptions.xhtml#ValueError "ValueError") in this case.
[`IOBase`](#io.IOBase "io.IOBase") (and its subclasses) supports the iterator protocol, meaning that an [`IOBase`](#io.IOBase "io.IOBase") object can be iterated over yielding the lines in a stream. Lines are defined slightly differently depending on whether the stream is a binary stream (yielding bytes), or a text stream (yielding character strings). See [`readline()`](#io.IOBase.readline "io.IOBase.readline") below.
[`IOBase`](#io.IOBase "io.IOBase") is also a context manager and therefore supports the [`with`](../reference/compound_stmts.xhtml#with) statement. In this example, *file* is closed after the `with` statement's suite is finished---even if an exception occurs:
```
with open('spam.txt', 'w') as file:
file.write('Spam and eggs!')
```
[`IOBase`](#io.IOBase "io.IOBase") provides these data attributes and methods:
`close`()Flush and close this stream. This method has no effect if the file is already closed. Once the file is closed, any operation on the file (e.g. reading or writing) will raise a [`ValueError`](exceptions.xhtml#ValueError "ValueError").
As a convenience, it is allowed to call this method more than once; only the first call, however, will have an effect.
`closed``True` if the stream is closed.
`fileno`()Return the underlying file descriptor (an integer) of the stream if it exists. An [`OSError`](exceptions.xhtml#OSError "OSError") is raised if the IO object does not use a file descriptor.
`flush`()Flush the write buffers of the stream if applicable. This does nothing for read-only and non-blocking streams.
`isatty`()Return `True` if the stream is interactive (i.e., connected to a terminal/tty device).
`readable`()Return `True` if the stream can be read from. If `False`, `read()`will raise [`OSError`](exceptions.xhtml#OSError "OSError").
`readline`(*size=-1*)Read and return one line from the stream. If *size* is specified, at most *size* bytes will be read.
The line terminator is always `b'\n'` for binary files; for text files, the *newline* argument to [`open()`](functions.xhtml#open "open") can be used to select the line terminator(s) recognized.
`readlines`(*hint=-1*)Read and return a list of lines from the stream. *hint* can be specified to control the number of lines read: no more lines will be read if the total size (in bytes/characters) of all lines so far exceeds *hint*.
Note that it's already possible to iterate on file objects using
```
for
line in file: ...
```
without calling `file.readlines()`.
`seek`(*offset*\[, *whence*\])Change the stream position to the given byte *offset*. *offset* is interpreted relative to the position indicated by *whence*. The default value for *whence* is `SEEK_SET`. Values for *whence* are:
- `SEEK_SET` or `0` -- start of the stream (the default); *offset* should be zero or positive
- `SEEK_CUR` or `1` -- current stream position; *offset* may be negative
- `SEEK_END` or `2` -- end of the stream; *offset* is usually negative
Return the new absolute position.
3\.1 新版功能: The `SEEK_*` constants.
3\.3 新版功能: Some operating systems could support additional values, like `os.SEEK_HOLE` or `os.SEEK_DATA`. The valid values for a file could depend on it being open in text or binary mode.
`seekable`()Return `True` if the stream supports random access. If `False`, [`seek()`](#io.IOBase.seek "io.IOBase.seek"), [`tell()`](#io.IOBase.tell "io.IOBase.tell") and [`truncate()`](#io.IOBase.truncate "io.IOBase.truncate") will raise [`OSError`](exceptions.xhtml#OSError "OSError").
`tell`()Return the current stream position.
`truncate`(*size=None*)Resize the stream to the given *size* in bytes (or the current position if *size* is not specified). The current stream position isn't changed. This resizing can extend or reduce the current file size. In case of extension, the contents of the new file area depend on the platform (on most systems, additional bytes are zero-filled). The new file size is returned.
在 3.5 版更改: Windows will now zero-fill files when extending.
`writable`()Return `True` if the stream supports writing. If `False`, `write()` and [`truncate()`](#io.IOBase.truncate "io.IOBase.truncate") will raise [`OSError`](exceptions.xhtml#OSError "OSError").
`writelines`(*lines*)Write a list of lines to the stream. Line separators are not added, so it is usual for each of the lines provided to have a line separator at the end.
`__del__`()Prepare for object destruction. [`IOBase`](#io.IOBase "io.IOBase") provides a default implementation of this method that calls the instance's [`close()`](#io.IOBase.close "io.IOBase.close") method.
*class* `io.``RawIOBase`Base class for raw binary I/O. It inherits [`IOBase`](#io.IOBase "io.IOBase"). There is no public constructor.
Raw binary I/O typically provides low-level access to an underlying OS device or API, and does not try to encapsulate it in high-level primitives (this is left to Buffered I/O and Text I/O, described later in this page).
In addition to the attributes and methods from [`IOBase`](#io.IOBase "io.IOBase"), [`RawIOBase`](#io.RawIOBase "io.RawIOBase") provides the following methods:
`read`(*size=-1*)Read up to *size* bytes from the object and return them. As a convenience, if *size* is unspecified or -1, all bytes until EOF are returned. Otherwise, only one system call is ever made. Fewer than *size* bytes may be returned if the operating system call returns fewer than *size* bytes.
If 0 bytes are returned, and *size* was not 0, this indicates end of file. If the object is in non-blocking mode and no bytes are available, `None` is returned.
The default implementation defers to [`readall()`](#io.RawIOBase.readall "io.RawIOBase.readall") and [`readinto()`](#io.RawIOBase.readinto "io.RawIOBase.readinto").
`readall`()Read and return all the bytes from the stream until EOF, using multiple calls to the stream if necessary.
`readinto`(*b*)Read bytes into a pre-allocated, writable [bytes-like object](../glossary.xhtml#term-bytes-like-object) *b*, and return the number of bytes read. For example, *b* might be a [`bytearray`](stdtypes.xhtml#bytearray "bytearray"). If the object is in non-blocking mode and no bytes are available, `None` is returned.
`write`(*b*)Write the given [bytes-like object](../glossary.xhtml#term-bytes-like-object), *b*, to the underlying raw stream, and return the number of bytes written. This can be less than the length of *b* in bytes, depending on specifics of the underlying raw stream, and especially if it is in non-blocking mode. `None` is returned if the raw stream is set not to block and no single byte could be readily written to it. The caller may release or mutate *b* after this method returns, so the implementation should only access *b*during the method call.
*class* `io.``BufferedIOBase`Base class for binary streams that support some kind of buffering. It inherits [`IOBase`](#io.IOBase "io.IOBase"). There is no public constructor.
The main difference with [`RawIOBase`](#io.RawIOBase "io.RawIOBase") is that methods [`read()`](#io.BufferedIOBase.read "io.BufferedIOBase.read"), [`readinto()`](#io.BufferedIOBase.readinto "io.BufferedIOBase.readinto") and [`write()`](#io.BufferedIOBase.write "io.BufferedIOBase.write") will try (respectively) to read as much input as requested or to consume all given output, at the expense of making perhaps more than one system call.
In addition, those methods can raise [`BlockingIOError`](exceptions.xhtml#BlockingIOError "BlockingIOError") if the underlying raw stream is in non-blocking mode and cannot take or give enough data; unlike their [`RawIOBase`](#io.RawIOBase "io.RawIOBase") counterparts, they will never return `None`.
Besides, the [`read()`](#io.BufferedIOBase.read "io.BufferedIOBase.read") method does not have a default implementation that defers to [`readinto()`](#io.BufferedIOBase.readinto "io.BufferedIOBase.readinto").
A typical [`BufferedIOBase`](#io.BufferedIOBase "io.BufferedIOBase") implementation should not inherit from a [`RawIOBase`](#io.RawIOBase "io.RawIOBase") implementation, but wrap one, like [`BufferedWriter`](#io.BufferedWriter "io.BufferedWriter") and [`BufferedReader`](#io.BufferedReader "io.BufferedReader") do.
[`BufferedIOBase`](#io.BufferedIOBase "io.BufferedIOBase") provides or overrides these methods and attribute in addition to those from [`IOBase`](#io.IOBase "io.IOBase"):
`raw`The underlying raw stream (a [`RawIOBase`](#io.RawIOBase "io.RawIOBase") instance) that [`BufferedIOBase`](#io.BufferedIOBase "io.BufferedIOBase") deals with. This is not part of the [`BufferedIOBase`](#io.BufferedIOBase "io.BufferedIOBase") API and may not exist on some implementations.
`detach`()Separate the underlying raw stream from the buffer and return it.
After the raw stream has been detached, the buffer is in an unusable state.
Some buffers, like [`BytesIO`](#io.BytesIO "io.BytesIO"), do not have the concept of a single raw stream to return from this method. They raise [`UnsupportedOperation`](#io.UnsupportedOperation "io.UnsupportedOperation").
3\.1 新版功能.
`read`(*size=-1*)Read and return up to *size* bytes. If the argument is omitted, `None`, or negative, data is read and returned until EOF is reached. An empty [`bytes`](stdtypes.xhtml#bytes "bytes") object is returned if the stream is already at EOF.
If the argument is positive, and the underlying raw stream is not interactive, multiple raw reads may be issued to satisfy the byte count (unless EOF is reached first). But for interactive raw streams, at most one raw read will be issued, and a short result does not imply that EOF is imminent.
A [`BlockingIOError`](exceptions.xhtml#BlockingIOError "BlockingIOError") is raised if the underlying raw stream is in non blocking-mode, and has no data available at the moment.
`read1`(\[*size*\])Read and return up to *size* bytes, with at most one call to the underlying raw stream's [`read()`](#io.RawIOBase.read "io.RawIOBase.read") (or [`readinto()`](#io.RawIOBase.readinto "io.RawIOBase.readinto")) method. This can be useful if you are implementing your own buffering on top of a [`BufferedIOBase`](#io.BufferedIOBase "io.BufferedIOBase")object.
If *size* is `-1` (the default), an arbitrary number of bytes are returned (more than zero unless EOF is reached).
`readinto`(*b*)Read bytes into a pre-allocated, writable [bytes-like object](../glossary.xhtml#term-bytes-like-object) *b* and return the number of bytes read. For example, *b* might be a [`bytearray`](stdtypes.xhtml#bytearray "bytearray").
Like [`read()`](#io.BufferedIOBase.read "io.BufferedIOBase.read"), multiple reads may be issued to the underlying raw stream, unless the latter is interactive.
A [`BlockingIOError`](exceptions.xhtml#BlockingIOError "BlockingIOError") is raised if the underlying raw stream is in non blocking-mode, and has no data available at the moment.
`readinto1`(*b*)Read bytes into a pre-allocated, writable [bytes-like object](../glossary.xhtml#term-bytes-like-object) *b*, using at most one call to the underlying raw stream's [`read()`](#io.RawIOBase.read "io.RawIOBase.read") (or [`readinto()`](#io.RawIOBase.readinto "io.RawIOBase.readinto")) method. Return the number of bytes read.
A [`BlockingIOError`](exceptions.xhtml#BlockingIOError "BlockingIOError") is raised if the underlying raw stream is in non blocking-mode, and has no data available at the moment.
3\.5 新版功能.
`write`(*b*)Write the given [bytes-like object](../glossary.xhtml#term-bytes-like-object), *b*, and return the number of bytes written (always equal to the length of *b* in bytes, since if the write fails an [`OSError`](exceptions.xhtml#OSError "OSError") will be raised). Depending on the actual implementation, these bytes may be readily written to the underlying stream, or held in a buffer for performance and latency reasons.
When in non-blocking mode, a [`BlockingIOError`](exceptions.xhtml#BlockingIOError "BlockingIOError") is raised if the data needed to be written to the raw stream but it couldn't accept all the data without blocking.
The caller may release or mutate *b* after this method returns, so the implementation should only access *b* during the method call.
### Raw File I/O
*class* `io.``FileIO`(*name*, *mode='r'*, *closefd=True*, *opener=None*)[`FileIO`](#io.FileIO "io.FileIO") represents an OS-level file containing bytes data. It implements the [`RawIOBase`](#io.RawIOBase "io.RawIOBase") interface (and therefore the [`IOBase`](#io.IOBase "io.IOBase") interface, too).
The *name* can be one of two things:
- a character string or [`bytes`](stdtypes.xhtml#bytes "bytes") object representing the path to the file which will be opened. In this case closefd must be `True` (the default) otherwise an error will be raised.
- an integer representing the number of an existing OS-level file descriptor to which the resulting [`FileIO`](#io.FileIO "io.FileIO") object will give access. When the FileIO object is closed this fd will be closed as well, unless *closefd*is set to `False`.
The *mode* can be `'r'`, `'w'`, `'x'` or `'a'` for reading (default), writing, exclusive creation or appending. The file will be created if it doesn't exist when opened for writing or appending; it will be truncated when opened for writing. [`FileExistsError`](exceptions.xhtml#FileExistsError "FileExistsError") will be raised if it already exists when opened for creating. Opening a file for creating implies writing, so this mode behaves in a similar way to `'w'`. Add a `'+'` to the mode to allow simultaneous reading and writing.
The `read()` (when called with a positive argument), `readinto()`and `write()` methods on this class will only make one system call.
A custom opener can be used by passing a callable as *opener*. The underlying file descriptor for the file object is then obtained by calling *opener* with (*name*, *flags*). *opener* must return an open file descriptor (passing [`os.open`](os.xhtml#os.open "os.open") as *opener* results in functionality similar to passing `None`).
新创建的文件是 [不可继承的](os.xhtml#fd-inheritance)。
See the [`open()`](functions.xhtml#open "open") built-in function for examples on using the *opener*parameter.
在 3.3 版更改: The *opener* parameter was added. The `'x'` mode was added.
在 3.4 版更改: 文件现在禁止继承。
In addition to the attributes and methods from [`IOBase`](#io.IOBase "io.IOBase") and [`RawIOBase`](#io.RawIOBase "io.RawIOBase"), [`FileIO`](#io.FileIO "io.FileIO") provides the following data attributes:
`mode`The mode as given in the constructor.
`name`The file name. This is the file descriptor of the file when no name is given in the constructor.
### Buffered Streams
Buffered I/O streams provide a higher-level interface to an I/O device than raw I/O does.
*class* `io.``BytesIO`(\[*initial\_bytes*\])A stream implementation using an in-memory bytes buffer. It inherits [`BufferedIOBase`](#io.BufferedIOBase "io.BufferedIOBase"). The buffer is discarded when the [`close()`](#io.IOBase.close "io.IOBase.close") method is called.
The optional argument *initial\_bytes* is a [bytes-like object](../glossary.xhtml#term-bytes-like-object) that contains initial data.
[`BytesIO`](#io.BytesIO "io.BytesIO") provides or overrides these methods in addition to those from [`BufferedIOBase`](#io.BufferedIOBase "io.BufferedIOBase") and [`IOBase`](#io.IOBase "io.IOBase"):
`getbuffer`()Return a readable and writable view over the contents of the buffer without copying them. Also, mutating the view will transparently update the contents of the buffer:
```
>>> b = io.BytesIO(b"abcdef")
>>> view = b.getbuffer()
>>> view[2:4] = b"56"
>>> b.getvalue()
b'ab56ef'
```
注解
As long as the view exists, the [`BytesIO`](#io.BytesIO "io.BytesIO") object cannot be resized or closed.
3\.2 新版功能.
`getvalue`()Return [`bytes`](stdtypes.xhtml#bytes "bytes") containing the entire contents of the buffer.
`read1`(\[*size*\])In [`BytesIO`](#io.BytesIO "io.BytesIO"), this is the same as [`read()`](#io.BufferedIOBase.read "io.BufferedIOBase.read").
在 3.7 版更改: The *size* argument is now optional.
`readinto1`(*b*)In [`BytesIO`](#io.BytesIO "io.BytesIO"), this is the same as [`readinto()`](#io.BufferedIOBase.readinto "io.BufferedIOBase.readinto").
3\.5 新版功能.
*class* `io.``BufferedReader`(*raw*, *buffer\_size=DEFAULT\_BUFFER\_SIZE*)A buffer providing higher-level access to a readable, sequential [`RawIOBase`](#io.RawIOBase "io.RawIOBase") object. It inherits [`BufferedIOBase`](#io.BufferedIOBase "io.BufferedIOBase"). When reading data from this object, a larger amount of data may be requested from the underlying raw stream, and kept in an internal buffer. The buffered data can then be returned directly on subsequent reads.
The constructor creates a [`BufferedReader`](#io.BufferedReader "io.BufferedReader") for the given readable *raw* stream and *buffer\_size*. If *buffer\_size* is omitted, [`DEFAULT_BUFFER_SIZE`](#io.DEFAULT_BUFFER_SIZE "io.DEFAULT_BUFFER_SIZE") is used.
[`BufferedReader`](#io.BufferedReader "io.BufferedReader") provides or overrides these methods in addition to those from [`BufferedIOBase`](#io.BufferedIOBase "io.BufferedIOBase") and [`IOBase`](#io.IOBase "io.IOBase"):
`peek`(\[*size*\])Return bytes from the stream without advancing the position. At most one single read on the raw stream is done to satisfy the call. The number of bytes returned may be less or more than requested.
`read`(\[*size*\])Read and return *size* bytes, or if *size* is not given or negative, until EOF or if the read call would block in non-blocking mode.
`read1`(\[*size*\])Read and return up to *size* bytes with only one call on the raw stream. If at least one byte is buffered, only buffered bytes are returned. Otherwise, one raw stream read call is made.
在 3.7 版更改: The *size* argument is now optional.
*class* `io.``BufferedWriter`(*raw*, *buffer\_size=DEFAULT\_BUFFER\_SIZE*)A buffer providing higher-level access to a writeable, sequential [`RawIOBase`](#io.RawIOBase "io.RawIOBase") object. It inherits [`BufferedIOBase`](#io.BufferedIOBase "io.BufferedIOBase"). When writing to this object, data is normally placed into an internal buffer. The buffer will be written out to the underlying [`RawIOBase`](#io.RawIOBase "io.RawIOBase")object under various conditions, including:
- when the buffer gets too small for all pending data;
- when [`flush()`](#io.BufferedWriter.flush "io.BufferedWriter.flush") is called;
- when a `seek()` is requested (for [`BufferedRandom`](#io.BufferedRandom "io.BufferedRandom") objects);
- when the [`BufferedWriter`](#io.BufferedWriter "io.BufferedWriter") object is closed or destroyed.
The constructor creates a [`BufferedWriter`](#io.BufferedWriter "io.BufferedWriter") for the given writeable *raw* stream. If the *buffer\_size* is not given, it defaults to [`DEFAULT_BUFFER_SIZE`](#io.DEFAULT_BUFFER_SIZE "io.DEFAULT_BUFFER_SIZE").
[`BufferedWriter`](#io.BufferedWriter "io.BufferedWriter") provides or overrides these methods in addition to those from [`BufferedIOBase`](#io.BufferedIOBase "io.BufferedIOBase") and [`IOBase`](#io.IOBase "io.IOBase"):
`flush`()Force bytes held in the buffer into the raw stream. A [`BlockingIOError`](exceptions.xhtml#BlockingIOError "BlockingIOError") should be raised if the raw stream blocks.
`write`(*b*)Write the [bytes-like object](../glossary.xhtml#term-bytes-like-object), *b*, and return the number of bytes written. When in non-blocking mode, a [`BlockingIOError`](exceptions.xhtml#BlockingIOError "BlockingIOError") is raised if the buffer needs to be written out but the raw stream blocks.
*class* `io.``BufferedRandom`(*raw*, *buffer\_size=DEFAULT\_BUFFER\_SIZE*)A buffered interface to random access streams. It inherits [`BufferedReader`](#io.BufferedReader "io.BufferedReader") and [`BufferedWriter`](#io.BufferedWriter "io.BufferedWriter"), and further supports `seek()` and `tell()` functionality.
The constructor creates a reader and writer for a seekable raw stream, given in the first argument. If the *buffer\_size* is omitted it defaults to [`DEFAULT_BUFFER_SIZE`](#io.DEFAULT_BUFFER_SIZE "io.DEFAULT_BUFFER_SIZE").
[`BufferedRandom`](#io.BufferedRandom "io.BufferedRandom") is capable of anything [`BufferedReader`](#io.BufferedReader "io.BufferedReader") or [`BufferedWriter`](#io.BufferedWriter "io.BufferedWriter") can do.
*class* `io.``BufferedRWPair`(*reader*, *writer*, *buffer\_size=DEFAULT\_BUFFER\_SIZE*)A buffered I/O object combining two unidirectional [`RawIOBase`](#io.RawIOBase "io.RawIOBase")objects -- one readable, the other writeable -- into a single bidirectional endpoint. It inherits [`BufferedIOBase`](#io.BufferedIOBase "io.BufferedIOBase").
*reader* and *writer* are [`RawIOBase`](#io.RawIOBase "io.RawIOBase") objects that are readable and writeable respectively. If the *buffer\_size* is omitted it defaults to [`DEFAULT_BUFFER_SIZE`](#io.DEFAULT_BUFFER_SIZE "io.DEFAULT_BUFFER_SIZE").
[`BufferedRWPair`](#io.BufferedRWPair "io.BufferedRWPair") implements all of [`BufferedIOBase`](#io.BufferedIOBase "io.BufferedIOBase")'s methods except for [`detach()`](#io.BufferedIOBase.detach "io.BufferedIOBase.detach"), which raises [`UnsupportedOperation`](#io.UnsupportedOperation "io.UnsupportedOperation").
警告
[`BufferedRWPair`](#io.BufferedRWPair "io.BufferedRWPair") does not attempt to synchronize accesses to its underlying raw streams. You should not pass it the same object as reader and writer; use [`BufferedRandom`](#io.BufferedRandom "io.BufferedRandom") instead.
### Text I/O
*class* `io.``TextIOBase`Base class for text streams. This class provides a character and line based interface to stream I/O. It inherits [`IOBase`](#io.IOBase "io.IOBase"). There is no public constructor.
[`TextIOBase`](#io.TextIOBase "io.TextIOBase") provides or overrides these data attributes and methods in addition to those from [`IOBase`](#io.IOBase "io.IOBase"):
`encoding`The name of the encoding used to decode the stream's bytes into strings, and to encode strings into bytes.
`errors`The error setting of the decoder or encoder.
`newlines`A string, a tuple of strings, or `None`, indicating the newlines translated so far. Depending on the implementation and the initial constructor flags, this may not be available.
`buffer`The underlying binary buffer (a [`BufferedIOBase`](#io.BufferedIOBase "io.BufferedIOBase") instance) that [`TextIOBase`](#io.TextIOBase "io.TextIOBase") deals with. This is not part of the [`TextIOBase`](#io.TextIOBase "io.TextIOBase") API and may not exist in some implementations.
`detach`()Separate the underlying binary buffer from the [`TextIOBase`](#io.TextIOBase "io.TextIOBase") and return it.
After the underlying buffer has been detached, the [`TextIOBase`](#io.TextIOBase "io.TextIOBase") is in an unusable state.
Some [`TextIOBase`](#io.TextIOBase "io.TextIOBase") implementations, like [`StringIO`](#io.StringIO "io.StringIO"), may not have the concept of an underlying buffer and calling this method will raise [`UnsupportedOperation`](#io.UnsupportedOperation "io.UnsupportedOperation").
3\.1 新版功能.
`read`(*size=-1*)Read and return at most *size* characters from the stream as a single [`str`](stdtypes.xhtml#str "str"). If *size* is negative or `None`, reads until EOF.
`readline`(*size=-1*)Read until newline or EOF and return a single `str`. If the stream is already at EOF, an empty string is returned.
If *size* is specified, at most *size* characters will be read.
`seek`(*offset*\[, *whence*\])Change the stream position to the given *offset*. Behaviour depends on the *whence* parameter. The default value for *whence* is `SEEK_SET`.
- `SEEK_SET` or `0`: seek from the start of the stream (the default); *offset* must either be a number returned by [`TextIOBase.tell()`](#io.TextIOBase.tell "io.TextIOBase.tell"), or zero. Any other *offset* value produces undefined behaviour.
- `SEEK_CUR` or `1`: "seek" to the current position; *offset* must be zero, which is a no-operation (all other values are unsupported).
- `SEEK_END` or `2`: seek to the end of the stream; *offset* must be zero (all other values are unsupported).
Return the new absolute position as an opaque number.
3\.1 新版功能: The `SEEK_*` constants.
`tell`()Return the current stream position as an opaque number. The number does not usually represent a number of bytes in the underlying binary storage.
`write`(*s*)Write the string *s* to the stream and return the number of characters written.
*class* `io.``TextIOWrapper`(*buffer*, *encoding=None*, *errors=None*, *newline=None*, *line\_buffering=False*, *write\_through=False*)A buffered text stream over a [`BufferedIOBase`](#io.BufferedIOBase "io.BufferedIOBase") binary stream. It inherits [`TextIOBase`](#io.TextIOBase "io.TextIOBase").
*encoding* gives the name of the encoding that the stream will be decoded or encoded with. It defaults to [`locale.getpreferredencoding(False)`](locale.xhtml#locale.getpreferredencoding "locale.getpreferredencoding").
*errors* is an optional string that specifies how encoding and decoding errors are to be handled. Pass `'strict'` to raise a [`ValueError`](exceptions.xhtml#ValueError "ValueError")exception if there is an encoding error (the default of `None` has the same effect), or pass `'ignore'` to ignore errors. (Note that ignoring encoding errors can lead to data loss.) `'replace'` causes a replacement marker (such as `'?'`) to be inserted where there is malformed data. `'backslashreplace'` causes malformed data to be replaced by a backslashed escape sequence. When writing, `'xmlcharrefreplace'`(replace with the appropriate XML character reference) or `'namereplace'`(replace with `\N{...}` escape sequences) can be used. Any other error handling name that has been registered with [`codecs.register_error()`](codecs.xhtml#codecs.register_error "codecs.register_error") is also valid.
*newline* controls how line endings are handled. It can be `None`, `''`, `'\n'`, `'\r'`, and `'\r\n'`. It works as follows:
- When reading input from the stream, if *newline* is `None`, [universal newlines](../glossary.xhtml#term-universal-newlines) mode is enabled. Lines in the input can end in `'\n'`, `'\r'`, or `'\r\n'`, and these are translated into `'\n'`before being returned to the caller. If it is `''`, universal newlines mode is enabled, but line endings are returned to the caller untranslated. If it has any of the other legal values, input lines are only terminated by the given string, and the line ending is returned to the caller untranslated.
- 将输出写入流时，如果 *newline* 为 `None`，则写入的任何 `'\n'` 字符都将转换为系统默认行分隔符 [`os.linesep`](os.xhtml#os.linesep "os.linesep")。如果 *newline* 是 `''` 或 `'\n'`，则不进行翻译。如果 *newline* 是任何其他合法值，则写入的任何 `'\n'` 字符将被转换为给定的字符串。
If *line\_buffering* is `True`, `flush()` is implied when a call to write contains a newline character or a carriage return.
If *write\_through* is `True`, calls to `write()` are guaranteed not to be buffered: any data written on the [`TextIOWrapper`](#io.TextIOWrapper "io.TextIOWrapper")object is immediately handled to its underlying binary *buffer*.
在 3.3 版更改: The *write\_through* argument has been added.
在 3.3 版更改: The default *encoding* is now `locale.getpreferredencoding(False)`instead of `locale.getpreferredencoding()`. Don't change temporary the locale encoding using [`locale.setlocale()`](locale.xhtml#locale.setlocale "locale.setlocale"), use the current locale encoding instead of the user preferred encoding.
[`TextIOWrapper`](#io.TextIOWrapper "io.TextIOWrapper") provides these members in addition to those of [`TextIOBase`](#io.TextIOBase "io.TextIOBase") and its parents:
`line_buffering`Whether line buffering is enabled.
`write_through`Whether writes are passed immediately to the underlying binary buffer.
3\.7 新版功能.
`reconfigure`(*\*\[, encoding\]\[, errors\]\[, newline\]\[, line\_buffering\]\[, write\_through\]*)Reconfigure this text stream using new settings for *encoding*, *errors*, *newline*, *line\_buffering* and *write\_through*.
Parameters not specified keep current settings, except `errors='strict` is used when *encoding* is specified but *errors* is not specified.
It is not possible to change the encoding or newline if some data has already been read from the stream. On the other hand, changing encoding after write is possible.
This method does an implicit stream flush before setting the new parameters.
3\.7 新版功能.
*class* `io.``StringIO`(*initial\_value=''*, *newline='\\n'*)An in-memory stream for text I/O. The text buffer is discarded when the [`close()`](#io.IOBase.close "io.IOBase.close") method is called.
The initial value of the buffer can be set by providing *initial\_value*. If newline translation is enabled, newlines will be encoded as if by [`write()`](#io.TextIOBase.write "io.TextIOBase.write"). The stream is positioned at the start of the buffer.
The *newline* argument works like that of [`TextIOWrapper`](#io.TextIOWrapper "io.TextIOWrapper"). The default is to consider only `\n` characters as ends of lines and to do no newline translation. If *newline* is set to `None`, newlines are written as `\n` on all platforms, but universal newline decoding is still performed when reading.
[`StringIO`](#io.StringIO "io.StringIO") provides this method in addition to those from [`TextIOBase`](#io.TextIOBase "io.TextIOBase") and its parents:
`getvalue`()Return a `str` containing the entire contents of the buffer. Newlines are decoded as if by [`read()`](#io.TextIOBase.read "io.TextIOBase.read"), although the stream position is not changed.
Example usage:
```
import io
output = io.StringIO()
output.write('First line.\n')
print('Second line.', file=output)
# Retrieve file contents -- this will be
# 'First line.\nSecond line.\n'
contents = output.getvalue()
# Close object and discard memory buffer --
# .getvalue() will now raise an exception.
output.close()
```
*class* `io.``IncrementalNewlineDecoder`A helper codec that decodes newlines for [universal newlines](../glossary.xhtml#term-universal-newlines) mode. It inherits [`codecs.IncrementalDecoder`](codecs.xhtml#codecs.IncrementalDecoder "codecs.IncrementalDecoder").
## 性能
This section discusses the performance of the provided concrete I/O implementations.
### Binary I/O
By reading and writing only large chunks of data even when the user asks for a single byte, buffered I/O hides any inefficiency in calling and executing the operating system's unbuffered I/O routines. The gain depends on the OS and the kind of I/O which is performed. For example, on some modern OSes such as Linux, unbuffered disk I/O can be as fast as buffered I/O. The bottom line, however, is that buffered I/O offers predictable performance regardless of the platform and the backing device. Therefore, it is almost always preferable to use buffered I/O rather than unbuffered I/O for binary data.
### Text I/O
Text I/O over a binary storage (such as a file) is significantly slower than binary I/O over the same storage, because it requires conversions between unicode and binary data using a character codec. This can become noticeable handling huge amounts of text data like large log files. Also, `TextIOWrapper.tell()` and `TextIOWrapper.seek()` are both quite slow due to the reconstruction algorithm used.
[`StringIO`](#io.StringIO "io.StringIO"), however, is a native in-memory unicode container and will exhibit similar speed to [`BytesIO`](#io.BytesIO "io.BytesIO").
### 多线程
[`FileIO`](#io.FileIO "io.FileIO") objects are thread-safe to the extent that the operating system calls (such as `read(2)` under Unix) they wrap are thread-safe too.
Binary buffered objects (instances of [`BufferedReader`](#io.BufferedReader "io.BufferedReader"), [`BufferedWriter`](#io.BufferedWriter "io.BufferedWriter"), [`BufferedRandom`](#io.BufferedRandom "io.BufferedRandom") and [`BufferedRWPair`](#io.BufferedRWPair "io.BufferedRWPair")) protect their internal structures using a lock; it is therefore safe to call them from multiple threads at once.
[`TextIOWrapper`](#io.TextIOWrapper "io.TextIOWrapper") objects are not thread-safe.
### Reentrancy
Binary buffered objects (instances of [`BufferedReader`](#io.BufferedReader "io.BufferedReader"), [`BufferedWriter`](#io.BufferedWriter "io.BufferedWriter"), [`BufferedRandom`](#io.BufferedRandom "io.BufferedRandom") and [`BufferedRWPair`](#io.BufferedRWPair "io.BufferedRWPair")) are not reentrant. While reentrant calls will not happen in normal situations, they can arise from doing I/O in a [`signal`](signal.xhtml#module-signal "signal: Set handlers for asynchronous events.") handler. If a thread tries to re-enter a buffered object which it is already accessing, a [`RuntimeError`](exceptions.xhtml#RuntimeError "RuntimeError")is raised. Note this doesn't prohibit a different thread from entering the buffered object.
The above implicitly extends to text files, since the [`open()`](functions.xhtml#open "open") function will wrap a buffered object inside a [`TextIOWrapper`](#io.TextIOWrapper "io.TextIOWrapper"). This includes standard streams and therefore affects the built-in function [`print()`](functions.xhtml#print "print") as well.
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- PEP 372: Adding an Ordered Dictionary to collections
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- PEP 389: The argparse Module for Parsing Command Lines
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- PEP 322: Reverse Iteration
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- 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
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- PEPs 252 and 253: Type and Class Changes
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- PEP 237: Unifying Long Integers and Integers
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- PEP 227: Nested Scopes
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- 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
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- Porting to 2.0
- Extending/Embedding Changes
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- 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