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Parses a variety of ``Accept-*`` headers.
These headers generally take the form of::
value1; q=0.5, value2; q=0
Where the ``q`` parameter is optional. In theory other parameters
exists, but this ignores them.
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Represents a generic ``Accept-*`` style header.
This object should not be modified. To add items you can use
``accept_obj + 'accept_thing'`` to get a new object
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Parse ``Accept-*`` style header.
Return iterator of ``(value, quality)`` pairs.
``quality`` defaults to 1.
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Returns true if the given object is listed in the accepted
types.
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Return the quality of the given offer. Returns None if there
is no match (not 0).
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DEPRECATED
Returns the first allowed offered type. Ignores quality.
Returns the first offered type if nothing else matches; or if you include None
at the end of the match list then that will be returned.
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Returns the best match in the sequence of offered types.
The sequence can be a simple sequence, or you can have
``(match, server_quality)`` items in the sequence. If you
have these tuples then the client quality is multiplied by the
server_quality to get a total. If two matches have equal
weight, then the one that shows up first in the `offers` list
will be returned.
But among matches with the same quality the match to a more specific
requested type will be chosen. For example a match to text/* trumps */*.
default_match (default None) is returned if there is no intersection.
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Represents the ``Accept`` header, which is a list of mimetypes.
This class knows about mime wildcards, like ``image/*``
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Returns true if any HTML-like type is accepted
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Check if the offer is covered by the mask
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