260 lines
11 KiB
ReStructuredText
260 lines
11 KiB
ReStructuredText
:mod:`email.mime`: Creating email and MIME objects from scratch
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---------------------------------------------------------------
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.. module:: email.mime
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:synopsis: Build MIME messages.
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**Source code:** :source:`Lib/email/mime/`
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--------------
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This module is part of the legacy (``Compat32``) email API. Its functionality
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is partially replaced by the :mod:`~email.contentmanager` in the new API, but
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in certain applications these classes may still be useful, even in non-legacy
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code.
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Ordinarily, you get a message object structure by passing a file or some text to
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a parser, which parses the text and returns the root message object. However
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you can also build a complete message structure from scratch, or even individual
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:class:`~email.message.Message` objects by hand. In fact, you can also take an
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existing structure and add new :class:`~email.message.Message` objects, move them
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around, etc. This makes a very convenient interface for slicing-and-dicing MIME
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messages.
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You can create a new object structure by creating :class:`~email.message.Message`
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instances, adding attachments and all the appropriate headers manually. For MIME
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messages though, the :mod:`email` package provides some convenient subclasses to
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make things easier.
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Here are the classes:
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.. currentmodule:: email.mime.base
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.. class:: MIMEBase(_maintype, _subtype, *, policy=compat32, **_params)
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Module: :mod:`email.mime.base`
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This is the base class for all the MIME-specific subclasses of
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:class:`~email.message.Message`. Ordinarily you won't create instances
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specifically of :class:`MIMEBase`, although you could. :class:`MIMEBase`
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is provided primarily as a convenient base class for more specific
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MIME-aware subclasses.
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*_maintype* is the :mailheader:`Content-Type` major type (e.g. :mimetype:`text`
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or :mimetype:`image`), and *_subtype* is the :mailheader:`Content-Type` minor
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type (e.g. :mimetype:`plain` or :mimetype:`gif`). *_params* is a parameter
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key/value dictionary and is passed directly to :meth:`Message.add_header
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<email.message.Message.add_header>`.
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If *policy* is specified, (defaults to the
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:class:`compat32 <email.policy.Compat32>` policy) it will be passed to
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:class:`~email.message.Message`.
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The :class:`MIMEBase` class always adds a :mailheader:`Content-Type` header
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(based on *_maintype*, *_subtype*, and *_params*), and a
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:mailheader:`MIME-Version` header (always set to ``1.0``).
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.. versionchanged:: 3.6
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Added *policy* keyword-only parameter.
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.. currentmodule:: email.mime.nonmultipart
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.. class:: MIMENonMultipart()
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Module: :mod:`email.mime.nonmultipart`
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A subclass of :class:`~email.mime.base.MIMEBase`, this is an intermediate base
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class for MIME messages that are not :mimetype:`multipart`. The primary
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purpose of this class is to prevent the use of the
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:meth:`~email.message.Message.attach` method, which only makes sense for
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:mimetype:`multipart` messages. If :meth:`~email.message.Message.attach`
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is called, a :exc:`~email.errors.MultipartConversionError` exception is raised.
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.. currentmodule:: email.mime.multipart
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.. class:: MIMEMultipart(_subtype='mixed', boundary=None, _subparts=None, \
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*, policy=compat32, **_params)
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Module: :mod:`email.mime.multipart`
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A subclass of :class:`~email.mime.base.MIMEBase`, this is an intermediate base
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class for MIME messages that are :mimetype:`multipart`. Optional *_subtype*
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defaults to :mimetype:`mixed`, but can be used to specify the subtype of the
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message. A :mailheader:`Content-Type` header of :mimetype:`multipart/_subtype`
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will be added to the message object. A :mailheader:`MIME-Version` header will
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also be added.
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Optional *boundary* is the multipart boundary string. When ``None`` (the
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default), the boundary is calculated when needed (for example, when the
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message is serialized).
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*_subparts* is a sequence of initial subparts for the payload. It must be
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possible to convert this sequence to a list. You can always attach new subparts
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to the message by using the :meth:`Message.attach
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<email.message.Message.attach>` method.
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Optional *policy* argument defaults to :class:`compat32 <email.policy.Compat32>`.
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Additional parameters for the :mailheader:`Content-Type` header are taken from
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the keyword arguments, or passed into the *_params* argument, which is a keyword
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dictionary.
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.. versionchanged:: 3.6
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Added *policy* keyword-only parameter.
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.. currentmodule:: email.mime.application
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.. class:: MIMEApplication(_data, _subtype='octet-stream', \
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_encoder=email.encoders.encode_base64, \
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*, policy=compat32, **_params)
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Module: :mod:`email.mime.application`
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A subclass of :class:`~email.mime.nonmultipart.MIMENonMultipart`, the
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:class:`MIMEApplication` class is used to represent MIME message objects of
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major type :mimetype:`application`. *_data* is a string containing the raw
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byte data. Optional *_subtype* specifies the MIME subtype and defaults to
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:mimetype:`octet-stream`.
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Optional *_encoder* is a callable (i.e. function) which will perform the actual
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encoding of the data for transport. This callable takes one argument, which is
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the :class:`MIMEApplication` instance. It should use
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:meth:`~email.message.Message.get_payload` and
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:meth:`~email.message.Message.set_payload` to change the payload to encoded
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form. It should also add
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any :mailheader:`Content-Transfer-Encoding` or other headers to the message
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object as necessary. The default encoding is base64. See the
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:mod:`email.encoders` module for a list of the built-in encoders.
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Optional *policy* argument defaults to :class:`compat32 <email.policy.Compat32>`.
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*_params* are passed straight through to the base class constructor.
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.. versionchanged:: 3.6
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Added *policy* keyword-only parameter.
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.. currentmodule:: email.mime.audio
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.. class:: MIMEAudio(_audiodata, _subtype=None, \
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_encoder=email.encoders.encode_base64, \
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*, policy=compat32, **_params)
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Module: :mod:`email.mime.audio`
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A subclass of :class:`~email.mime.nonmultipart.MIMENonMultipart`, the
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:class:`MIMEAudio` class is used to create MIME message objects of major type
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:mimetype:`audio`. *_audiodata* is a string containing the raw audio data. If
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this data can be decoded by the standard Python module :mod:`sndhdr`, then the
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subtype will be automatically included in the :mailheader:`Content-Type` header.
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Otherwise you can explicitly specify the audio subtype via the *_subtype*
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argument. If the minor type could not be guessed and *_subtype* was not given,
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then :exc:`TypeError` is raised.
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Optional *_encoder* is a callable (i.e. function) which will perform the actual
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encoding of the audio data for transport. This callable takes one argument,
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which is the :class:`MIMEAudio` instance. It should use
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:meth:`~email.message.Message.get_payload` and
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:meth:`~email.message.Message.set_payload` to change the payload to encoded
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form. It should also add
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any :mailheader:`Content-Transfer-Encoding` or other headers to the message
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object as necessary. The default encoding is base64. See the
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:mod:`email.encoders` module for a list of the built-in encoders.
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Optional *policy* argument defaults to :class:`compat32 <email.policy.Compat32>`.
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*_params* are passed straight through to the base class constructor.
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.. versionchanged:: 3.6
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Added *policy* keyword-only parameter.
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.. currentmodule:: email.mime.image
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.. class:: MIMEImage(_imagedata, _subtype=None, \
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_encoder=email.encoders.encode_base64, \
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*, policy=compat32, **_params)
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Module: :mod:`email.mime.image`
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A subclass of :class:`~email.mime.nonmultipart.MIMENonMultipart`, the
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:class:`MIMEImage` class is used to create MIME message objects of major type
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:mimetype:`image`. *_imagedata* is a string containing the raw image data. If
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this data can be decoded by the standard Python module :mod:`imghdr`, then the
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subtype will be automatically included in the :mailheader:`Content-Type` header.
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Otherwise you can explicitly specify the image subtype via the *_subtype*
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argument. If the minor type could not be guessed and *_subtype* was not given,
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then :exc:`TypeError` is raised.
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Optional *_encoder* is a callable (i.e. function) which will perform the actual
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encoding of the image data for transport. This callable takes one argument,
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which is the :class:`MIMEImage` instance. It should use
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:meth:`~email.message.Message.get_payload` and
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:meth:`~email.message.Message.set_payload` to change the payload to encoded
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form. It should also add
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any :mailheader:`Content-Transfer-Encoding` or other headers to the message
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object as necessary. The default encoding is base64. See the
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:mod:`email.encoders` module for a list of the built-in encoders.
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Optional *policy* argument defaults to :class:`compat32 <email.policy.Compat32>`.
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*_params* are passed straight through to the :class:`~email.mime.base.MIMEBase`
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constructor.
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.. versionchanged:: 3.6
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Added *policy* keyword-only parameter.
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.. currentmodule:: email.mime.message
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.. class:: MIMEMessage(_msg, _subtype='rfc822', *, policy=compat32)
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Module: :mod:`email.mime.message`
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A subclass of :class:`~email.mime.nonmultipart.MIMENonMultipart`, the
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:class:`MIMEMessage` class is used to create MIME objects of main type
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:mimetype:`message`. *_msg* is used as the payload, and must be an instance
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of class :class:`~email.message.Message` (or a subclass thereof), otherwise
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a :exc:`TypeError` is raised.
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Optional *_subtype* sets the subtype of the message; it defaults to
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:mimetype:`rfc822`.
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Optional *policy* argument defaults to :class:`compat32 <email.policy.Compat32>`.
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.. versionchanged:: 3.6
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Added *policy* keyword-only parameter.
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.. currentmodule:: email.mime.text
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.. class:: MIMEText(_text, _subtype='plain', _charset=None, *, policy=compat32)
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Module: :mod:`email.mime.text`
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A subclass of :class:`~email.mime.nonmultipart.MIMENonMultipart`, the
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:class:`MIMEText` class is used to create MIME objects of major type
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:mimetype:`text`. *_text* is the string for the payload. *_subtype* is the
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minor type and defaults to :mimetype:`plain`. *_charset* is the character
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set of the text and is passed as an argument to the
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:class:`~email.mime.nonmultipart.MIMENonMultipart` constructor; it defaults
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to ``us-ascii`` if the string contains only ``ascii`` code points, and
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``utf-8`` otherwise. The *_charset* parameter accepts either a string or a
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:class:`~email.charset.Charset` instance.
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Unless the *_charset* argument is explicitly set to ``None``, the
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MIMEText object created will have both a :mailheader:`Content-Type` header
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with a ``charset`` parameter, and a :mailheader:`Content-Transfer-Encoding`
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header. This means that a subsequent ``set_payload`` call will not result
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in an encoded payload, even if a charset is passed in the ``set_payload``
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command. You can "reset" this behavior by deleting the
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``Content-Transfer-Encoding`` header, after which a ``set_payload`` call
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will automatically encode the new payload (and add a new
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:mailheader:`Content-Transfer-Encoding` header).
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Optional *policy* argument defaults to :class:`compat32 <email.policy.Compat32>`.
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.. versionchanged:: 3.5
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*_charset* also accepts :class:`~email.charset.Charset` instances.
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.. versionchanged:: 3.6
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Added *policy* keyword-only parameter.
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