19.1.10. email.mime : Creating email and MIME objects from scratch ¶

源代码： Lib/email/mime/

---

This module is part of the legacy ( Compat32 ) email API. Its functionality is partially replaced by the contentmanager in the new API, but in certain applications these classes may still be useful, even in non-legacy code.

Ordinarily, you get a message object structure by passing a file or some text to a parser, which parses the text and returns the root message object. However you can also build a complete message structure from scratch, or even individual Message objects by hand. In fact, you can also take an existing structure and add new Message objects, move them around, etc. This makes a very convenient interface for slicing-and-dicing MIME messages.

You can create a new object structure by creating Message instances, adding attachments and all the appropriate headers manually. For MIME messages though, the email package provides some convenient subclasses to make things easier.

Here are the classes:

class email.mime.base. MIMEBase ( _maintype , _subtype , * , policy=compat32 , **_params ) ¶

Module: email.mime.base

This is the base class for all the MIME-specific subclasses of Message . Ordinarily you won’t create instances specifically of MIMEBase , although you could. MIMEBase is provided primarily as a convenient base class for more specific MIME-aware subclasses.

_maintype 是 Content-Type major type (e.g. text or image ), and _subtype 是 Content-Type minor type (e.g. plain or gif ). _params is a parameter key/value dictionary and is passed directly to Message.add_header .

若 policy is specified, (defaults to the compat32 policy) it will be passed to Message .

MIMEBase class always adds a Content-Type header (based on _maintype , _subtype ，和 _params )，和 MIME-Version header (always set to 1.0 ).

3.6 版改变： 添加 policy keyword-only parameter.

class email.mime.nonmultipart. MIMENonMultipart ¶

Module: email.mime.nonmultipart

子类化的 MIMEBase , this is an intermediate base class for MIME messages that are not multipart . The primary purpose of this class is to prevent the use of the attach() method, which only makes sense for multipart messages. If attach() is called, a MultipartConversionError 异常被引发。

class email.mime.multipart. MIMEMultipart ( _subtype='mixed' , boundary=None , _subparts=None , * , policy=compat32 , **_params ) ¶

Module: email.mime.multipart

子类化的 MIMEBase , this is an intermediate base class for MIME messages that are multipart . Optional _subtype 默认为 mixed , but can be used to specify the subtype of the message. A Content-Type header of multipart/_subtype will be added to the message object. A MIME-Version header will also be added.

可选 boundary is the multipart boundary string. When None (the default), the boundary is calculated when needed (for example, when the message is serialized).

_subparts is a sequence of initial subparts for the payload. It must be possible to convert this sequence to a list. You can always attach new subparts to the message by using the Message.attach 方法。

可选 policy argument defaults to compat32 .

Additional parameters for the Content-Type header are taken from the keyword arguments, or passed into the _params argument, which is a keyword dictionary.

3.6 版改变： 添加 policy keyword-only parameter.

class email.mime.application. MIMEApplication ( _data , _subtype='octet-stream' , _encoder=email.encoders.encode_base64 , * , policy=compat32 , **_params ) ¶

Module: email.mime.application

子类化的 MIMENonMultipart ， MIMEApplication class is used to represent MIME message objects of major type application . _data is a string containing the raw byte data. Optional _subtype specifies the MIME subtype and defaults to octet-stream .

可选 _encoder is a callable (i.e. function) which will perform the actual encoding of the data for transport. This callable takes one argument, which is the MIMEApplication instance. It should use get_payload() and set_payload() to change the payload to encoded form. It should also add any Content-Transfer-Encoding or other headers to the message object as necessary. The default encoding is base64. See the email.encoders module for a list of the built-in encoders.

可选 policy argument defaults to compat32 .

_params are passed straight through to the base class constructor.

3.6 版改变： 添加 policy keyword-only parameter.

class email.mime.audio. MIMEAudio ( _audiodata , _subtype=None , _encoder=email.encoders.encode_base64 , * , policy=compat32 , **_params ) ¶

Module: email.mime.audio

子类化的 MIMENonMultipart ， MIMEAudio class is used to create MIME message objects of major type audio . _audiodata is a string containing the raw audio data. If this data can be decoded by the standard Python module sndhdr , then the subtype will be automatically included in the Content-Type header. Otherwise you can explicitly specify the audio subtype via the _subtype argument. If the minor type could not be guessed and _subtype was not given, then TypeError 被引发。

可选 _encoder is a callable (i.e. function) which will perform the actual encoding of the audio data for transport. This callable takes one argument, which is the MIMEAudio instance. It should use get_payload() and set_payload() to change the payload to encoded form. It should also add any Content-Transfer-Encoding or other headers to the message object as necessary. The default encoding is base64. See the email.encoders module for a list of the built-in encoders.

可选 policy argument defaults to compat32 .

_params are passed straight through to the base class constructor.

3.6 版改变： 添加 policy keyword-only parameter.

class email.mime.image. MIMEImage ( _imagedata , _subtype=None , _encoder=email.encoders.encode_base64 , * , policy=compat32 , **_params ) ¶

Module: email.mime.image

子类化的 MIMENonMultipart ， MIMEImage class is used to create MIME message objects of major type image . _imagedata is a string containing the raw image data. If this data can be decoded by the standard Python module imghdr , then the subtype will be automatically included in the Content-Type header. Otherwise you can explicitly specify the image subtype via the _subtype argument. If the minor type could not be guessed and _subtype was not given, then TypeError 被引发。

可选 _encoder is a callable (i.e. function) which will perform the actual encoding of the image data for transport. This callable takes one argument, which is the MIMEImage instance. It should use get_payload() and set_payload() to change the payload to encoded form. It should also add any Content-Transfer-Encoding or other headers to the message object as necessary. The default encoding is base64. See the email.encoders module for a list of the built-in encoders.

可选 policy argument defaults to compat32 .

_params are passed straight through to the MIMEBase 构造函数。

3.6 版改变： 添加 policy keyword-only parameter.

class email.mime.message. MIMEMessage ( _msg , _subtype='rfc822' , * , policy=compat32 ) ¶

Module: email.mime.message

子类化的 MIMENonMultipart ， MIMEMessage class is used to create MIME objects of main type message . _msg is used as the payload, and must be an instance of class Message (or a subclass thereof), otherwise a TypeError 被引发。

可选 _subtype sets the subtype of the message; it defaults to rfc822 .

可选 policy argument defaults to compat32 .

3.6 版改变： 添加 policy keyword-only parameter.

class email.mime.text. MIMEText ( _text , _subtype='plain' , _charset=None , * , policy=compat32 ) ¶

Module: email.mime.text

子类化的 MIMENonMultipart ， MIMEText class is used to create MIME objects of major type text . _text is the string for the payload. _subtype is the minor type and defaults to plain . _charset is the character set of the text and is passed as an argument to the MIMENonMultipart constructor; it defaults to us-ascii if the string contains only ascii code points, and utf-8 otherwise. The _charset parameter accepts either a string or a Charset 实例。

Unless the _charset argument is explicitly set to None , the MIMEText object created will have both a Content-Type header with a charset parameter, and a Content-Transfer-Encoding header. This means that a subsequent set_payload call will not result in an encoded payload, even if a charset is passed in the set_payload command. You can “reset” this behavior by deleting the Content-Transfer-Encoding header, after which a set_payload call will automatically encode the new payload (and add a new Content-Transfer-Encoding header).

可选 policy argument defaults to compat32 .

3.5 版改变： _charset also accepts Charset 实例。

3.6 版改变： 添加 policy keyword-only parameter.

上一话题

19.1.9. email.message.Message : Representing an email message using the compat32 API

下一话题

19.1.11. email.header : Internationalized headers