270 lines
9.8 KiB
ReStructuredText
270 lines
9.8 KiB
ReStructuredText
:mod:`mimetypes` --- Map filenames to MIME types
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================================================
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.. module:: mimetypes
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:synopsis: Mapping of filename extensions to MIME types.
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.. sectionauthor:: Fred L. Drake, Jr. <fdrake@acm.org>
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**Source code:** :source:`Lib/mimetypes.py`
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.. index:: pair: MIME; content type
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--------------
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The :mod:`mimetypes` module converts between a filename or URL and the MIME type
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associated with the filename extension. Conversions are provided from filename
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to MIME type and from MIME type to filename extension; encodings are not
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supported for the latter conversion.
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The module provides one class and a number of convenience functions. The
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functions are the normal interface to this module, but some applications may be
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interested in the class as well.
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The functions described below provide the primary interface for this module. If
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the module has not been initialized, they will call :func:`init` if they rely on
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the information :func:`init` sets up.
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.. function:: guess_type(url, strict=True)
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.. index:: pair: MIME; headers
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Guess the type of a file based on its filename or URL, given by *url*. The
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return value is a tuple ``(type, encoding)`` where *type* is ``None`` if the
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type can't be guessed (missing or unknown suffix) or a string of the form
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``'type/subtype'``, usable for a MIME :mailheader:`content-type` header.
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*encoding* is ``None`` for no encoding or the name of the program used to encode
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(e.g. :program:`compress` or :program:`gzip`). The encoding is suitable for use
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as a :mailheader:`Content-Encoding` header, **not** as a
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:mailheader:`Content-Transfer-Encoding` header. The mappings are table driven.
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Encoding suffixes are case sensitive; type suffixes are first tried case
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sensitively, then case insensitively.
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The optional *strict* argument is a flag specifying whether the list of known MIME types
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is limited to only the official types `registered with IANA
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<https://www.iana.org/assignments/media-types/media-types.xhtml>`_.
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When *strict* is ``True`` (the default), only the IANA types are supported; when
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*strict* is ``False``, some additional non-standard but commonly used MIME types
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are also recognized.
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.. function:: guess_all_extensions(type, strict=True)
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Guess the extensions for a file based on its MIME type, given by *type*. The
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return value is a list of strings giving all possible filename extensions,
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including the leading dot (``'.'``). The extensions are not guaranteed to have
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been associated with any particular data stream, but would be mapped to the MIME
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type *type* by :func:`guess_type`.
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The optional *strict* argument has the same meaning as with the :func:`guess_type` function.
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.. function:: guess_extension(type, strict=True)
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Guess the extension for a file based on its MIME type, given by *type*. The
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return value is a string giving a filename extension, including the leading dot
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(``'.'``). The extension is not guaranteed to have been associated with any
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particular data stream, but would be mapped to the MIME type *type* by
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:func:`guess_type`. If no extension can be guessed for *type*, ``None`` is
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returned.
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The optional *strict* argument has the same meaning as with the :func:`guess_type` function.
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Some additional functions and data items are available for controlling the
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behavior of the module.
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.. function:: init(files=None)
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Initialize the internal data structures. If given, *files* must be a sequence
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of file names which should be used to augment the default type map. If omitted,
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the file names to use are taken from :const:`knownfiles`; on Windows, the
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current registry settings are loaded. Each file named in *files* or
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:const:`knownfiles` takes precedence over those named before it. Calling
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:func:`init` repeatedly is allowed.
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Specifying an empty list for *files* will prevent the system defaults from
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being applied: only the well-known values will be present from a built-in list.
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If *files* is ``None`` the internal data structure is completely rebuilt to its
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initial default value. This is a stable operation and will produce the same results
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when called multiple times.
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.. versionchanged:: 3.2
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Previously, Windows registry settings were ignored.
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.. function:: read_mime_types(filename)
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Load the type map given in the file *filename*, if it exists. The type map is
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returned as a dictionary mapping filename extensions, including the leading dot
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(``'.'``), to strings of the form ``'type/subtype'``. If the file *filename*
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does not exist or cannot be read, ``None`` is returned.
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.. function:: add_type(type, ext, strict=True)
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Add a mapping from the MIME type *type* to the extension *ext*. When the
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extension is already known, the new type will replace the old one. When the type
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is already known the extension will be added to the list of known extensions.
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When *strict* is ``True`` (the default), the mapping will be added to the
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official MIME types, otherwise to the non-standard ones.
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.. data:: inited
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Flag indicating whether or not the global data structures have been initialized.
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This is set to ``True`` by :func:`init`.
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.. data:: knownfiles
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.. index:: single: file; mime.types
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List of type map file names commonly installed. These files are typically named
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:file:`mime.types` and are installed in different locations by different
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packages.
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.. data:: suffix_map
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Dictionary mapping suffixes to suffixes. This is used to allow recognition of
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encoded files for which the encoding and the type are indicated by the same
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extension. For example, the :file:`.tgz` extension is mapped to :file:`.tar.gz`
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to allow the encoding and type to be recognized separately.
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.. data:: encodings_map
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Dictionary mapping filename extensions to encoding types.
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.. data:: types_map
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Dictionary mapping filename extensions to MIME types.
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.. data:: common_types
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Dictionary mapping filename extensions to non-standard, but commonly found MIME
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types.
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An example usage of the module::
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>>> import mimetypes
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>>> mimetypes.init()
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>>> mimetypes.knownfiles
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['/etc/mime.types', '/etc/httpd/mime.types', ... ]
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>>> mimetypes.suffix_map['.tgz']
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'.tar.gz'
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>>> mimetypes.encodings_map['.gz']
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'gzip'
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>>> mimetypes.types_map['.tgz']
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'application/x-tar-gz'
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.. _mimetypes-objects:
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MimeTypes Objects
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-----------------
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The :class:`MimeTypes` class may be useful for applications which may want more
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than one MIME-type database; it provides an interface similar to the one of the
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:mod:`mimetypes` module.
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.. class:: MimeTypes(filenames=(), strict=True)
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This class represents a MIME-types database. By default, it provides access to
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the same database as the rest of this module. The initial database is a copy of
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that provided by the module, and may be extended by loading additional
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:file:`mime.types`\ -style files into the database using the :meth:`read` or
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:meth:`readfp` methods. The mapping dictionaries may also be cleared before
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loading additional data if the default data is not desired.
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The optional *filenames* parameter can be used to cause additional files to be
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loaded "on top" of the default database.
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.. attribute:: MimeTypes.suffix_map
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Dictionary mapping suffixes to suffixes. This is used to allow recognition of
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encoded files for which the encoding and the type are indicated by the same
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extension. For example, the :file:`.tgz` extension is mapped to :file:`.tar.gz`
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to allow the encoding and type to be recognized separately. This is initially a
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copy of the global :data:`suffix_map` defined in the module.
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.. attribute:: MimeTypes.encodings_map
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Dictionary mapping filename extensions to encoding types. This is initially a
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copy of the global :data:`encodings_map` defined in the module.
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.. attribute:: MimeTypes.types_map
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Tuple containing two dictionaries, mapping filename extensions to MIME types:
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the first dictionary is for the non-standards types and the second one is for
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the standard types. They are initialized by :data:`common_types` and
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:data:`types_map`.
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.. attribute:: MimeTypes.types_map_inv
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Tuple containing two dictionaries, mapping MIME types to a list of filename
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extensions: the first dictionary is for the non-standards types and the
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second one is for the standard types. They are initialized by
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:data:`common_types` and :data:`types_map`.
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.. method:: MimeTypes.guess_extension(type, strict=True)
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Similar to the :func:`guess_extension` function, using the tables stored as part
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of the object.
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.. method:: MimeTypes.guess_type(url, strict=True)
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Similar to the :func:`guess_type` function, using the tables stored as part of
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the object.
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.. method:: MimeTypes.guess_all_extensions(type, strict=True)
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Similar to the :func:`guess_all_extensions` function, using the tables stored
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as part of the object.
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.. method:: MimeTypes.read(filename, strict=True)
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Load MIME information from a file named *filename*. This uses :meth:`readfp` to
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parse the file.
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If *strict* is ``True``, information will be added to list of standard types,
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else to the list of non-standard types.
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.. method:: MimeTypes.readfp(fp, strict=True)
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Load MIME type information from an open file *fp*. The file must have the format of
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the standard :file:`mime.types` files.
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If *strict* is ``True``, information will be added to the list of standard
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types, else to the list of non-standard types.
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.. method:: MimeTypes.read_windows_registry(strict=True)
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Load MIME type information from the Windows registry.
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.. availability:: Windows.
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If *strict* is ``True``, information will be added to the list of standard
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types, else to the list of non-standard types.
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.. versionadded:: 3.2
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