mimetypes.MimeTypes.guess_extension

MimeTypes.guess_extension(type, strict=True)

Guess the extension for a file based on its MIME type.

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.

Optional `strict’ argument when false adds a bunch of commonly found, but non-standard types.