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FormatCheckera
A ``format`` property checker.
JSON Schema does not mandate that the ``format`` property actually do any
validation. If validation is desired however, instances of this class can
be hooked into validators to enable format validation.
:class:`FormatChecker` objects always return ``True`` when asked about
formats that they do not know how to validate.
To check a custom format using a function that takes an instance and
returns a ``bool``, use the :meth:`FormatChecker.checks` or
:meth:`FormatChecker.cls_checks` decorators.
Arguments:
formats (iterable):
The known formats to validate. This argument can be used to
limit which formats will be used during validation.
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Register a decorated function as validating a new format.
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format (str):
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Check whether the instance conforms to the given format.
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