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# [`smtplib`](#module-smtplib "smtplib: SMTP protocol client (requires sockets).") ---SMTP协议客户端
**Source code:** [Lib/smtplib.py](https://github.com/python/cpython/tree/3.7/Lib/smtplib.py) \[https://github.com/python/cpython/tree/3.7/Lib/smtplib.py\]
- - - - - -
The [`smtplib`](#module-smtplib "smtplib: SMTP protocol client (requires sockets).") module defines an SMTP client session object that can be used to send mail to any Internet machine with an SMTP or ESMTP listener daemon. For details of SMTP and ESMTP operation, consult [**RFC 821**](https://tools.ietf.org/html/rfc821.html) \[https://tools.ietf.org/html/rfc821.html\] (Simple Mail Transfer Protocol) and [**RFC 1869**](https://tools.ietf.org/html/rfc1869.html) \[https://tools.ietf.org/html/rfc1869.html\] (SMTP Service Extensions).
*class* `smtplib.``SMTP`(*host=''*, *port=0*, *local\_hostname=None*, \[*timeout*, \]*source\_address=None*)An [`SMTP`](#smtplib.SMTP "smtplib.SMTP") instance encapsulates an SMTP connection. It has methods that support a full repertoire of SMTP and ESMTP operations. If the optional host and port parameters are given, the SMTP [`connect()`](#smtplib.SMTP.connect "smtplib.SMTP.connect") method is called with those parameters during initialization. If specified, *local\_hostname* is used as the FQDN of the local host in the HELO/EHLO command. Otherwise, the local hostname is found using [`socket.getfqdn()`](socket.xhtml#socket.getfqdn "socket.getfqdn"). If the [`connect()`](#smtplib.SMTP.connect "smtplib.SMTP.connect") call returns anything other than a success code, an [`SMTPConnectError`](#smtplib.SMTPConnectError "smtplib.SMTPConnectError") is raised. The optional *timeout* parameter specifies a timeout in seconds for blocking operations like the connection attempt (if not specified, the global default timeout setting will be used). If the timeout expires, [`socket.timeout`](socket.xhtml#socket.timeout "socket.timeout") is raised. The optional source\_address parameter allows binding to some specific source address in a machine with multiple network interfaces, and/or to some specific source TCP port. It takes a 2-tuple (host, port), for the socket to bind to as its source address before connecting. If omitted (or if host or port are `''` and/or 0 respectively) the OS default behavior will be used.
For normal use, you should only require the initialization/connect, [`sendmail()`](#smtplib.SMTP.sendmail "smtplib.SMTP.sendmail"), and [`SMTP.quit()`](#smtplib.SMTP.quit "smtplib.SMTP.quit") methods. An example is included below.
The [`SMTP`](#smtplib.SMTP "smtplib.SMTP") class supports the [`with`](../reference/compound_stmts.xhtml#with) statement. When used like this, the SMTP `QUIT` command is issued automatically when the `with` statement exits. E.g.:
```
>>> from smtplib import SMTP
>>> with SMTP("domain.org") as smtp:
... smtp.noop()
...
(250, b'Ok')
>>>
```
在 3.3 版更改: 支持了 [`with`](../reference/compound_stmts.xhtml#with) 语句。
在 3.3 版更改: source\_address argument was added.
3\.5 新版功能: The SMTPUTF8 extension ([**RFC 6531**](https://tools.ietf.org/html/rfc6531.html) \[https://tools.ietf.org/html/rfc6531.html\]) is now supported.
*class* `smtplib.``SMTP_SSL`(*host=''*, *port=0*, *local\_hostname=None*, *keyfile=None*, *certfile=None*, \[*timeout*, \]*context=None*, *source\_address=None*)An [`SMTP_SSL`](#smtplib.SMTP_SSL "smtplib.SMTP_SSL") instance behaves exactly the same as instances of [`SMTP`](#smtplib.SMTP "smtplib.SMTP"). [`SMTP_SSL`](#smtplib.SMTP_SSL "smtplib.SMTP_SSL") should be used for situations where SSL is required from the beginning of the connection and using `starttls()` is not appropriate. If *host* is not specified, the local host is used. If *port* is zero, the standard SMTP-over-SSL port (465) is used. The optional arguments *local\_hostname*, *timeout* and *source\_address* have the same meaning as they do in the [`SMTP`](#smtplib.SMTP "smtplib.SMTP") class. *context*, also optional, can contain a [`SSLContext`](ssl.xhtml#ssl.SSLContext "ssl.SSLContext") and allows configuring various aspects of the secure connection. Please read [Security considerations](ssl.xhtml#ssl-security) for best practices.
*keyfile* and *certfile* are a legacy alternative to *context*, and can point to a PEM formatted private key and certificate chain file for the SSL connection.
在 3.3 版更改: *context* was added.
在 3.3 版更改: source\_address argument was added.
在 3.4 版更改: The class now supports hostname check with [`ssl.SSLContext.check_hostname`](ssl.xhtml#ssl.SSLContext.check_hostname "ssl.SSLContext.check_hostname") and *Server Name Indication* (see [`ssl.HAS_SNI`](ssl.xhtml#ssl.HAS_SNI "ssl.HAS_SNI")).
3\.6 版后已移除: *keyfile* and *certfile* are deprecated in favor of *context*. Please use [`ssl.SSLContext.load_cert_chain()`](ssl.xhtml#ssl.SSLContext.load_cert_chain "ssl.SSLContext.load_cert_chain") instead, or let [`ssl.create_default_context()`](ssl.xhtml#ssl.create_default_context "ssl.create_default_context") select the system's trusted CA certificates for you.
*class* `smtplib.``LMTP`(*host=''*, *port=LMTP\_PORT*, *local\_hostname=None*, *source\_address=None*)The LMTP protocol, which is very similar to ESMTP, is heavily based on the standard SMTP client. It's common to use Unix sockets for LMTP, so our `connect()` method must support that as well as a regular host:port server. The optional arguments local\_hostname and source\_address have the same meaning as they do in the [`SMTP`](#smtplib.SMTP "smtplib.SMTP") class. To specify a Unix socket, you must use an absolute path for *host*, starting with a '/'.
Authentication is supported, using the regular SMTP mechanism. When using a Unix socket, LMTP generally don't support or require any authentication, but your mileage might vary.
A nice selection of exceptions is defined as well:
*exception* `smtplib.``SMTPException`Subclass of [`OSError`](exceptions.xhtml#OSError "OSError") that is the base exception class for all the other exceptions provided by this module.
在 3.4 版更改: SMTPException became subclass of [`OSError`](exceptions.xhtml#OSError "OSError")
*exception* `smtplib.``SMTPServerDisconnected`This exception is raised when the server unexpectedly disconnects, or when an attempt is made to use the [`SMTP`](#smtplib.SMTP "smtplib.SMTP") instance before connecting it to a server.
*exception* `smtplib.``SMTPResponseException`Base class for all exceptions that include an SMTP error code. These exceptions are generated in some instances when the SMTP server returns an error code. The error code is stored in the `smtp_code` attribute of the error, and the `smtp_error` attribute is set to the error message.
*exception* `smtplib.``SMTPSenderRefused`Sender address refused. In addition to the attributes set by on all [`SMTPResponseException`](#smtplib.SMTPResponseException "smtplib.SMTPResponseException") exceptions, this sets 'sender' to the string that the SMTP server refused.
*exception* `smtplib.``SMTPRecipientsRefused`All recipient addresses refused. The errors for each recipient are accessible through the attribute `recipients`, which is a dictionary of exactly the same sort as [`SMTP.sendmail()`](#smtplib.SMTP.sendmail "smtplib.SMTP.sendmail") returns.
*exception* `smtplib.``SMTPDataError`The SMTP server refused to accept the message data.
*exception* `smtplib.``SMTPConnectError`Error occurred during establishment of a connection with the server.
*exception* `smtplib.``SMTPHeloError`The server refused our `HELO` message.
*exception* `smtplib.``SMTPNotSupportedError`The command or option attempted is not supported by the server.
3\.5 新版功能.
*exception* `smtplib.``SMTPAuthenticationError`SMTP authentication went wrong. Most probably the server didn't accept the username/password combination provided.
参见
[**RFC 821**](https://tools.ietf.org/html/rfc821.html) \[https://tools.ietf.org/html/rfc821.html\] - Simple Mail Transfer ProtocolProtocol definition for SMTP. This document covers the model, operating procedure, and protocol details for SMTP.
[**RFC 1869**](https://tools.ietf.org/html/rfc1869.html) \[https://tools.ietf.org/html/rfc1869.html\] - SMTP Service ExtensionsDefinition of the ESMTP extensions for SMTP. This describes a framework for extending SMTP with new commands, supporting dynamic discovery of the commands provided by the server, and defines a few additional commands.
## SMTP Objects
An [`SMTP`](#smtplib.SMTP "smtplib.SMTP") instance has the following methods:
`SMTP.``set_debuglevel`(*level*)Set the debug output level. A value of 1 or `True` for *level* results in debug messages for connection and for all messages sent to and received from the server. A value of 2 for *level* results in these messages being timestamped.
在 3.5 版更改: Added debuglevel 2.
`SMTP.``docmd`(*cmd*, *args=''*)Send a command *cmd* to the server. The optional argument *args* is simply concatenated to the command, separated by a space.
This returns a 2-tuple composed of a numeric response code and the actual response line (multiline responses are joined into one long line.)
In normal operation it should not be necessary to call this method explicitly. It is used to implement other methods and may be useful for testing private extensions.
If the connection to the server is lost while waiting for the reply, [`SMTPServerDisconnected`](#smtplib.SMTPServerDisconnected "smtplib.SMTPServerDisconnected") will be raised.
`SMTP.``connect`(*host='localhost'*, *port=0*)Connect to a host on a given port. The defaults are to connect to the local host at the standard SMTP port (25). If the hostname ends with a colon (`':'`) followed by a number, that suffix will be stripped off and the number interpreted as the port number to use. This method is automatically invoked by the constructor if a host is specified during instantiation. Returns a 2-tuple of the response code and message sent by the server in its connection response.
`SMTP.``helo`(*name=''*)Identify yourself to the SMTP server using `HELO`. The hostname argument defaults to the fully qualified domain name of the local host. The message returned by the server is stored as the `helo_resp` attribute of the object.
In normal operation it should not be necessary to call this method explicitly. It will be implicitly called by the [`sendmail()`](#smtplib.SMTP.sendmail "smtplib.SMTP.sendmail") when necessary.
`SMTP.``ehlo`(*name=''*)Identify yourself to an ESMTP server using `EHLO`. The hostname argument defaults to the fully qualified domain name of the local host. Examine the response for ESMTP option and store them for use by [`has_extn()`](#smtplib.SMTP.has_extn "smtplib.SMTP.has_extn"). Also sets several informational attributes: the message returned by the server is stored as the `ehlo_resp` attribute, `does_esmtp`is set to true or false depending on whether the server supports ESMTP, and `esmtp_features` will be a dictionary containing the names of the SMTP service extensions this server supports, and their parameters (if any).
Unless you wish to use [`has_extn()`](#smtplib.SMTP.has_extn "smtplib.SMTP.has_extn") before sending mail, it should not be necessary to call this method explicitly. It will be implicitly called by [`sendmail()`](#smtplib.SMTP.sendmail "smtplib.SMTP.sendmail") when necessary.
`SMTP.``ehlo_or_helo_if_needed`()This method calls [`ehlo()`](#smtplib.SMTP.ehlo "smtplib.SMTP.ehlo") and/or [`helo()`](#smtplib.SMTP.helo "smtplib.SMTP.helo") if there has been no previous `EHLO` or `HELO` command this session. It tries ESMTP `EHLO`first.
[`SMTPHeloError`](#smtplib.SMTPHeloError "smtplib.SMTPHeloError")The server didn't reply properly to the `HELO` greeting.
`SMTP.``has_extn`(*name*)Return [`True`](constants.xhtml#True "True") if *name* is in the set of SMTP service extensions returned by the server, [`False`](constants.xhtml#False "False") otherwise. Case is ignored.
`SMTP.``verify`(*address*)Check the validity of an address on this server using SMTP `VRFY`. Returns a tuple consisting of code 250 and a full [**RFC 822**](https://tools.ietf.org/html/rfc822.html) \[https://tools.ietf.org/html/rfc822.html\] address (including human name) if the user address is valid. Otherwise returns an SMTP error code of 400 or greater and an error string.
注解
Many sites disable SMTP `VRFY` in order to foil spammers.
`SMTP.``login`(*user*, *password*, *\**, *initial\_response\_ok=True*)Log in on an SMTP server that requires authentication. The arguments are the username and the password to authenticate with. If there has been no previous `EHLO` or `HELO` command this session, this method tries ESMTP `EHLO`first. This method will return normally if the authentication was successful, or may raise the following exceptions:
[`SMTPHeloError`](#smtplib.SMTPHeloError "smtplib.SMTPHeloError")The server didn't reply properly to the `HELO` greeting.
[`SMTPAuthenticationError`](#smtplib.SMTPAuthenticationError "smtplib.SMTPAuthenticationError")The server didn't accept the username/password combination.
[`SMTPNotSupportedError`](#smtplib.SMTPNotSupportedError "smtplib.SMTPNotSupportedError")The `AUTH` command is not supported by the server.
[`SMTPException`](#smtplib.SMTPException "smtplib.SMTPException")No suitable authentication method was found.
Each of the authentication methods supported by [`smtplib`](#module-smtplib "smtplib: SMTP protocol client (requires sockets).") are tried in turn if they are advertised as supported by the server. See [`auth()`](#smtplib.SMTP.auth "smtplib.SMTP.auth")for a list of supported authentication methods. *initial\_response\_ok* is passed through to [`auth()`](#smtplib.SMTP.auth "smtplib.SMTP.auth").
Optional keyword argument *initial\_response\_ok* specifies whether, for authentication methods that support it, an "initial response" as specified in [**RFC 4954**](https://tools.ietf.org/html/rfc4954.html) \[https://tools.ietf.org/html/rfc4954.html\] can be sent along with the `AUTH` command, rather than requiring a challenge/response.
在 3.5 版更改: [`SMTPNotSupportedError`](#smtplib.SMTPNotSupportedError "smtplib.SMTPNotSupportedError") may be raised, and the *initial\_response\_ok* parameter was added.
`SMTP.``auth`(*mechanism*, *authobject*, *\**, *initial\_response\_ok=True*)Issue an `SMTP``AUTH` command for the specified authentication *mechanism*, and handle the challenge response via *authobject*.
*mechanism* specifies which authentication mechanism is to be used as argument to the `AUTH` command; the valid values are those listed in the `auth` element of `esmtp_features`.
*authobject* must be a callable object taking an optional single argument:
> data = authobject(challenge=None)
If optional keyword argument *initial\_response\_ok* is true, `authobject()` will be called first with no argument. It can return the [**RFC 4954**](https://tools.ietf.org/html/rfc4954.html) \[https://tools.ietf.org/html/rfc4954.html\] "initial response" ASCII `str` which will be encoded and sent with the `AUTH` command as below. If the `authobject()` does not support an initial response (e.g. because it requires a challenge), it should return `None` when called with `challenge=None`. If *initial\_response\_ok* is false, then `authobject()` will not be called first with `None`.
If the initial response check returns `None`, or if *initial\_response\_ok* is false, `authobject()` will be called to process the server's challenge response; the *challenge* argument it is passed will be a `bytes`. It should return ASCII `str` *data* that will be base64 encoded and sent to the server.
The `SMTP` class provides `authobjects` for the `CRAM-MD5`, `PLAIN`, and `LOGIN` mechanisms; they are named `SMTP.auth_cram_md5`, `SMTP.auth_plain`, and `SMTP.auth_login` respectively. They all require that the `user` and `password` properties of the `SMTP` instance are set to appropriate values.
User code does not normally need to call `auth` directly, but can instead call the [`login()`](#smtplib.SMTP.login "smtplib.SMTP.login") method, which will try each of the above mechanisms in turn, in the order listed. `auth` is exposed to facilitate the implementation of authentication methods not (or not yet) supported directly by [`smtplib`](#module-smtplib "smtplib: SMTP protocol client (requires sockets).").
3\.5 新版功能.
`SMTP.``starttls`(*keyfile=None*, *certfile=None*, *context=None*)Put the SMTP connection in TLS (Transport Layer Security) mode. All SMTP commands that follow will be encrypted. You should then call [`ehlo()`](#smtplib.SMTP.ehlo "smtplib.SMTP.ehlo")again.
If *keyfile* and *certfile* are provided, they are used to create an [`ssl.SSLContext`](ssl.xhtml#ssl.SSLContext "ssl.SSLContext").
Optional *context* parameter is an [`ssl.SSLContext`](ssl.xhtml#ssl.SSLContext "ssl.SSLContext") object; This is an alternative to using a keyfile and a certfile and if specified both *keyfile* and *certfile* should be `None`.
If there has been no previous `EHLO` or `HELO` command this session, this method tries ESMTP `EHLO` first.
3\.6 版后已移除: *keyfile* and *certfile* are deprecated in favor of *context*. Please use [`ssl.SSLContext.load_cert_chain()`](ssl.xhtml#ssl.SSLContext.load_cert_chain "ssl.SSLContext.load_cert_chain") instead, or let [`ssl.create_default_context()`](ssl.xhtml#ssl.create_default_context "ssl.create_default_context") select the system's trusted CA certificates for you.
[`SMTPHeloError`](#smtplib.SMTPHeloError "smtplib.SMTPHeloError")The server didn't reply properly to the `HELO` greeting.
[`SMTPNotSupportedError`](#smtplib.SMTPNotSupportedError "smtplib.SMTPNotSupportedError")The server does not support the STARTTLS extension.
[`RuntimeError`](exceptions.xhtml#RuntimeError "RuntimeError")SSL/TLS support is not available to your Python interpreter.
在 3.3 版更改: *context* was added.
在 3.4 版更改: The method now supports hostname check with `SSLContext.check_hostname` and *Server Name Indicator* (see [`HAS_SNI`](ssl.xhtml#ssl.HAS_SNI "ssl.HAS_SNI")).
在 3.5 版更改: The error raised for lack of STARTTLS support is now the [`SMTPNotSupportedError`](#smtplib.SMTPNotSupportedError "smtplib.SMTPNotSupportedError") subclass instead of the base [`SMTPException`](#smtplib.SMTPException "smtplib.SMTPException").
`SMTP.``sendmail`(*from\_addr*, *to\_addrs*, *msg*, *mail\_options=()*, *rcpt\_options=()*)Send mail. The required arguments are an [**RFC 822**](https://tools.ietf.org/html/rfc822.html) \[https://tools.ietf.org/html/rfc822.html\] from-address string, a list of [**RFC 822**](https://tools.ietf.org/html/rfc822.html) \[https://tools.ietf.org/html/rfc822.html\] to-address strings (a bare string will be treated as a list with 1 address), and a message string. The caller may pass a list of ESMTP options (such as `8bitmime`) to be used in `MAIL FROM` commands as *mail\_options*. ESMTP options (such as `DSN` commands) that should be used with all `RCPT`commands can be passed as *rcpt\_options*. (If you need to use different ESMTP options to different recipients you have to use the low-level methods such as `mail()`, `rcpt()` and `data()` to send the message.)
注解
The *from\_addr* and *to\_addrs* parameters are used to construct the message envelope used by the transport agents. `sendmail` does not modify the message headers in any way.
*msg* may be a string containing characters in the ASCII range, or a byte string. A string is encoded to bytes using the ascii codec, and lone `\r`and `\n` characters are converted to `\r\n` characters. A byte string is not modified.
If there has been no previous `EHLO` or `HELO` command this session, this method tries ESMTP `EHLO` first. If the server does ESMTP, message size and each of the specified options will be passed to it (if the option is in the feature set the server advertises). If `EHLO` fails, `HELO` will be tried and ESMTP options suppressed.
This method will return normally if the mail is accepted for at least one recipient. Otherwise it will raise an exception. That is, if this method does not raise an exception, then someone should get your mail. If this method does not raise an exception, it returns a dictionary, with one entry for each recipient that was refused. Each entry contains a tuple of the SMTP error code and the accompanying error message sent by the server.
If `SMTPUTF8` is included in *mail\_options*, and the server supports it, *from\_addr* and *to\_addrs* may contain non-ASCII characters.
This method may raise the following exceptions:
[`SMTPRecipientsRefused`](#smtplib.SMTPRecipientsRefused "smtplib.SMTPRecipientsRefused")All recipients were refused. Nobody got the mail. The `recipients`attribute of the exception object is a dictionary with information about the refused recipients (like the one returned when at least one recipient was accepted).
[`SMTPHeloError`](#smtplib.SMTPHeloError "smtplib.SMTPHeloError")The server didn't reply properly to the `HELO` greeting.
[`SMTPSenderRefused`](#smtplib.SMTPSenderRefused "smtplib.SMTPSenderRefused")The server didn't accept the *from\_addr*.
[`SMTPDataError`](#smtplib.SMTPDataError "smtplib.SMTPDataError")The server replied with an unexpected error code (other than a refusal of a recipient).
[`SMTPNotSupportedError`](#smtplib.SMTPNotSupportedError "smtplib.SMTPNotSupportedError")`SMTPUTF8` was given in the *mail\_options* but is not supported by the server.
Unless otherwise noted, the connection will be open even after an exception is raised.
在 3.2 版更改: *msg* may be a byte string.
在 3.5 版更改: `SMTPUTF8` support added, and [`SMTPNotSupportedError`](#smtplib.SMTPNotSupportedError "smtplib.SMTPNotSupportedError") may be raised if `SMTPUTF8` is specified but the server does not support it.
`SMTP.``send_message`(*msg*, *from\_addr=None*, *to\_addrs=None*, *mail\_options=()*, *rcpt\_options=()*)This is a convenience method for calling [`sendmail()`](#smtplib.SMTP.sendmail "smtplib.SMTP.sendmail") with the message represented by an [`email.message.Message`](email.compat32-message.xhtml#email.message.Message "email.message.Message") object. The arguments have the same meaning as for [`sendmail()`](#smtplib.SMTP.sendmail "smtplib.SMTP.sendmail"), except that *msg* is a `Message`object.
If *from\_addr* is `None` or *to\_addrs* is `None`, `send_message` fills those arguments with addresses extracted from the headers of *msg* as specified in [**RFC 5322**](https://tools.ietf.org/html/rfc5322.html) \[https://tools.ietf.org/html/rfc5322.html\]: *from\_addr* is set to the *Sender*field if it is present, and otherwise to the *From* field. *to\_addrs* combines the values (if any) of the *To*, *Cc*, and *Bcc* fields from *msg*. If exactly one set of *Resent-\** headers appear in the message, the regular headers are ignored and the *Resent-\** headers are used instead. If the message contains more than one set of *Resent-\** headers, a [`ValueError`](exceptions.xhtml#ValueError "ValueError") is raised, since there is no way to unambiguously detect the most recent set of *Resent-* headers.
`send_message` serializes *msg* using [`BytesGenerator`](email.generator.xhtml#email.generator.BytesGenerator "email.generator.BytesGenerator") with `\r\n` as the *linesep*, and calls [`sendmail()`](#smtplib.SMTP.sendmail "smtplib.SMTP.sendmail") to transmit the resulting message. Regardless of the values of *from\_addr* and *to\_addrs*, `send_message` does not transmit any *Bcc* or *Resent-Bcc* headers that may appear in *msg*. If any of the addresses in *from\_addr* and *to\_addrs* contain non-ASCII characters and the server does not advertise `SMTPUTF8` support, an `SMTPNotSupported` error is raised. Otherwise the `Message` is serialized with a clone of its [`policy`](email.policy.xhtml#module-email.policy "email.policy: Controlling the parsing and generating of messages") with the [`utf8`](email.policy.xhtml#email.policy.EmailPolicy.utf8 "email.policy.EmailPolicy.utf8") attribute set to `True`, and `SMTPUTF8` and `BODY=8BITMIME` are added to *mail\_options*.
3\.2 新版功能.
3\.5 新版功能: Support for internationalized addresses (`SMTPUTF8`).
`SMTP.``quit`()Terminate the SMTP session and close the connection. Return the result of the SMTP `QUIT` command.
Low-level methods corresponding to the standard SMTP/ESMTP commands `HELP`, `RSET`, `NOOP`, `MAIL`, `RCPT`, and `DATA` are also supported. Normally these do not need to be called directly, so they are not documented here. For details, consult the module code.
## SMTP Example
This example prompts the user for addresses needed in the message envelope ('To' and 'From' addresses), and the message to be delivered. Note that the headers to be included with the message must be included in the message as entered; this example doesn't do any processing of the [**RFC 822**](https://tools.ietf.org/html/rfc822.html) \[https://tools.ietf.org/html/rfc822.html\] headers. In particular, the 'To' and 'From' addresses must be included in the message headers explicitly.
```
import smtplib
def prompt(prompt):
return input(prompt).strip()
fromaddr = prompt("From: ")
toaddrs = prompt("To: ").split()
print("Enter message, end with ^D (Unix) or ^Z (Windows):")
# Add the From: and To: headers at the start!
msg = ("From: %s\r\nTo: %s\r\n\r\n"
% (fromaddr, ", ".join(toaddrs)))
while True:
try:
line = input()
except EOFError:
break
if not line:
break
msg = msg + line
print("Message length is", len(msg))
server = smtplib.SMTP('localhost')
server.set_debuglevel(1)
server.sendmail(fromaddr, toaddrs, msg)
server.quit()
```
注解
In general, you will want to use the [`email`](email.xhtml#module-email "email: Package supporting the parsing, manipulating, and generating email messages.") package's features to construct an email message, which you can then send via [`send_message()`](#smtplib.SMTP.send_message "smtplib.SMTP.send_message"); see [email: 示例](email.examples.xhtml#email-examples).
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- Python文档内容
- Python 有什么新变化？
- Python 3.7 有什么新变化
- 摘要 - 发布重点
- 新的特性
- 其他语言特性修改
- 新增模块
- 改进的模块
- C API 的改变
- 构建的改变
- 性能优化
- 其他 CPython 实现的改变
- 已弃用的 Python 行为
- 已弃用的 Python 模块、函数和方法
- 已弃用的 C API 函数和类型
- 平台支持的移除
- API 与特性的移除
- 移除的模块
- Windows 专属的改变
- 移植到 Python 3.7
- Python 3.7.1 中的重要变化
- Python 3.7.2 中的重要变化
- Python 3.6 有什么新变化A
- 摘要 - 发布重点
- 新的特性
- 其他语言特性修改
- 新增模块
- 改进的模块
- 性能优化
- Build and C API Changes
- 其他改进
- 弃用
- 移除
- 移植到Python 3.6
- Python 3.6.2 中的重要变化
- Python 3.6.4 中的重要变化
- Python 3.6.5 中的重要变化
- Python 3.6.7 中的重要变化
- Python 3.5 有什么新变化
- 摘要 - 发布重点
- 新的特性
- 其他语言特性修改
- 新增模块
- 改进的模块
- Other module-level changes
- 性能优化
- Build and C API Changes
- 弃用
- 移除
- Porting to Python 3.5
- Notable changes in Python 3.5.4
- What's New In Python 3.4
- 摘要 - 发布重点
- 新的特性
- 新增模块
- 改进的模块
- CPython Implementation Changes
- 弃用
- 移除
- Porting to Python 3.4
- Changed in 3.4.3
- 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
- New, Improved, and Deprecated Modules
- 多线程
- 性能优化
- Unicode
- Codecs
- 文档
- IDLE
- Code Repository
- Build and C API Changes
- Porting to Python 3.2
- What's New In Python 3.1
- PEP 372: Ordered Dictionaries
- PEP 378: Format Specifier for Thousands Separator
- 其他语言特性修改
- New, Improved, and Deprecated Modules
- 性能优化
- IDLE
- Build and C API Changes
- Porting to Python 3.1
- What's New In Python 3.0
- Common Stumbling Blocks
- Overview Of Syntax Changes
- Changes Already Present In Python 2.6
- Library Changes
- PEP 3101: A New Approach To String Formatting
- Changes To Exceptions
- 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