19.5. "mimetypes" --- Mapeia nomes de arquivos para tipos MIME
**************************************************************

**Código Fonte:** Lib/mimetypes.py

======================================================================

O módulo "mimetypes" converte entre um nome de arquivo ou URL e o tipo
MIME associado à extensão do arquivo. As conversões são fornecidas do
nome do arquivo para o tipo MIME e da extensão do tipo MIME para o
nome do arquivo; codificações não são suportadas para a última
conversão.

O módulo fornece uma classe e várias funções convenientes. As funções
são a interface normal para este módulo, mas algumas aplicações também
podem estar interessadas na classe.

As funções descritas abaixo fornecem a interface principal para este
módulo.  Se o módulo não foi inicializado, eles chamarão "init()" se
confiarem nas informações "init()" configuradas.

mimetypes.guess_type(url, strict=True)

   Guess the type of a file based on its filename or URL, given by
   *url*.  The return value is a tuple "(type, encoding)" where *type*
   is "None" if the type can't be guessed (missing or unknown suffix)
   or a string of the form "'type/subtype'", usable for a MIME
   *content-type* header.

   *encoding* é "None" para nenhuma codificação ou o nome do programa
   usado para codificar (por exemplo **compress** ou **gzip**). A
   codificação é adequada para uso como cabeçalho *Content-Encoding* ,
   **não** como cabeçalho *Content-Transfer-Encoding*. Os mapeamentos
   são orientados por tabela. Os sufixos de codificação diferenciam
   maiúsculas de minúsculas; os sufixos de tipo são testados primeiro
   com maiúsculas e minúsculas e depois sem maiúsculas.

   O argumento opcional *strict* é um sinalizados que especifica se
   alista de tipos MIME conhecidos é limitada apenas aos tipos
   oficiais registrados na IANA. Quando *strict* é "True" (o padrão),
   apenas os tipos IANA são suportados; quando *strict* é "False",
   alguns tipos MIME adicionais não padronizados, mas geralmente
   usados, também são reconhecidos.

mimetypes.guess_all_extensions(type, strict=True)

   Adivinhe as extensões para um arquivo com base em seu tipo MIME,
   fornecido pelo *tipo*. O valor de retorno é uma lista de cadeias
   que fornecem todas as extensões possíveis de nome de arquivo,
   incluindo o ponto ("'.'").  Não é garantido que as extensões tenham
   sido associadas a qualquer fluxo de dados específico, mas seriam
   mapeadas para o tipo MIME *tipo* por "guess_type()".

   O argumento opcional *strict* tem o mesmo significado que com a
   função "guess_type()".

mimetypes.guess_extension(type, strict=True)

   Guess the extension for a file based on its MIME type, given by
   *type*. The return value is a string giving a filename extension,
   including the leading dot ("'.'").  The extension is not guaranteed
   to have been associated with any particular data stream, but would
   be mapped to the MIME type *type* by "guess_type()".  If no
   extension can be guessed for *type*, "None" is returned.

   O argumento opcional *strict* tem o mesmo significado que com a
   função "guess_type()".

Some additional functions and data items are available for controlling
the behavior of the module.

mimetypes.init(files=None)

   Initialize the internal data structures.  If given, *files* must be
   a sequence of file names which should be used to augment the
   default type map.  If omitted, the file names to use are taken from
   "knownfiles"; on Windows, the current registry settings are loaded.
   Each file named in *files* or "knownfiles" takes precedence over
   those named before it.  Calling "init()" repeatedly is allowed.

   Specifying an empty list for *files* will prevent the system
   defaults from being applied: only the well-known values will be
   present from a built-in list.

   Alterado na versão 3.2: Previously, Windows registry settings were
   ignored.

mimetypes.read_mime_types(filename)

   Load the type map given in the file *filename*, if it exists.  The
   type map is returned as a dictionary mapping filename extensions,
   including the leading dot ("'.'"), to strings of the form
   "'type/subtype'".  If the file *filename* does not exist or cannot
   be read, "None" is returned.

mimetypes.add_type(type, ext, strict=True)

   Add a mapping from the MIME type *type* to the extension *ext*.
   When the extension is already known, the new type will replace the
   old one. When the type is already known the extension will be added
   to the list of known extensions.

   When *strict* is "True" (the default), the mapping will be added to
   the official MIME types, otherwise to the non-standard ones.

mimetypes.inited

   Flag indicating whether or not the global data structures have been
   initialized. This is set to "True" by "init()".

mimetypes.knownfiles

   List of type map file names commonly installed.  These files are
   typically named "mime.types" and are installed in different
   locations by different packages.

mimetypes.suffix_map

   Dictionary mapping suffixes to suffixes.  This is used to allow
   recognition of encoded files for which the encoding and the type
   are indicated by the same extension.  For example, the ".tgz"
   extension is mapped to ".tar.gz" to allow the encoding and type to
   be recognized separately.

mimetypes.encodings_map

   Dictionary mapping filename extensions to encoding types.

mimetypes.types_map

   Dictionary mapping filename extensions to MIME types.

mimetypes.common_types

   Dictionary mapping filename extensions to non-standard, but
   commonly found MIME types.

An example usage of the module:

   >>> import mimetypes
   >>> mimetypes.init()
   >>> mimetypes.knownfiles
   ['/etc/mime.types', '/etc/httpd/mime.types', ... ]
   >>> mimetypes.suffix_map['.tgz']
   '.tar.gz'
   >>> mimetypes.encodings_map['.gz']
   'gzip'
   >>> mimetypes.types_map['.tgz']
   'application/x-tar-gz'


19.5.1. Objetos MimeTypes
=========================

The "MimeTypes" class may be useful for applications which may want
more than one MIME-type database; it provides an interface similar to
the one of the "mimetypes" module.

class mimetypes.MimeTypes(filenames=(), strict=True)

   This class represents a MIME-types database.  By default, it
   provides access to the same database as the rest of this module.
   The initial database is a copy of that provided by the module, and
   may be extended by loading additional "mime.types"-style files into
   the database using the "read()" or "readfp()" methods.  The mapping
   dictionaries may also be cleared before loading additional data if
   the default data is not desired.

   The optional *filenames* parameter can be used to cause additional
   files to be loaded "on top" of the default database.

   suffix_map

      Dictionary mapping suffixes to suffixes.  This is used to allow
      recognition of encoded files for which the encoding and the type
      are indicated by the same extension.  For example, the ".tgz"
      extension is mapped to ".tar.gz" to allow the encoding and type
      to be recognized separately.  This is initially a copy of the
      global "suffix_map" defined in the module.

   encodings_map

      Dictionary mapping filename extensions to encoding types.  This
      is initially a copy of the global "encodings_map" defined in the
      module.

   types_map

      Tuple containing two dictionaries, mapping filename extensions
      to MIME types: the first dictionary is for the non-standards
      types and the second one is for the standard types. They are
      initialized by "common_types" and "types_map".

   types_map_inv

      Tuple containing two dictionaries, mapping MIME types to a list
      of filename extensions: the first dictionary is for the non-
      standards types and the second one is for the standard types.
      They are initialized by "common_types" and "types_map".

   guess_extension(type, strict=True)

      Similar to the "guess_extension()" function, using the tables
      stored as part of the object.

   guess_type(url, strict=True)

      Similar to the "guess_type()" function, using the tables stored
      as part of the object.

   guess_all_extensions(type, strict=True)

      Similar to the "guess_all_extensions()" function, using the
      tables stored as part of the object.

   read(filename, strict=True)

      Load MIME information from a file named *filename*.  This uses
      "readfp()" to parse the file.

      If *strict* is "True", information will be added to list of
      standard types, else to the list of non-standard types.

   readfp(fp, strict=True)

      Carrega informações do tipo MIME de um arquivo aberto *fp*. O
      arquivo precisa estar no formato padrão dos arquivos
      "mime.types".

      If *strict* is "True", information will be added to the list of
      standard types, else to the list of non-standard types.

   read_windows_registry(strict=True)

      Load MIME type information from the Windows registry.
      Availability: Windows.

      If *strict* is "True", information will be added to the list of
      standard types, else to the list of non-standard types.

      Novo na versão 3.2.
