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- class UnsetValue(object):
- """
- An unset value.
- This is used in situations where a blank value like `None` is acceptable
- usually as the default value of a class variable or function parameter
- (iow, usually when `None` is a valid value.)
- """
- def __str__(self):
- return '<unset value>'
- def __repr__(self):
- return '<unset value>'
- def __bool__(self):
- return False
- def __nonzero__(self):
- return False
- unset_value = UnsetValue()
- class WebobInputWrapper(object):
- """
- Wrap a webob MultiDict for use as passing as `formdata` to Field.
- Since for consistency, we have decided in WTForms to support as input a
- small subset of the API provided in common between cgi.FieldStorage,
- Django's QueryDict, and Werkzeug's MultiDict, we need to wrap Webob, the
- only supported framework whose multidict does not fit this API, but is
- nevertheless used by a lot of frameworks.
- While we could write a full wrapper to support all the methods, this will
- undoubtedly result in bugs due to some subtle differences between the
- various wrappers. So we will keep it simple.
- """
- def __init__(self, multidict):
- self._wrapped = multidict
- def __iter__(self):
- return iter(self._wrapped)
- def __len__(self):
- return len(self._wrapped)
- def __contains__(self, name):
- return (name in self._wrapped)
- def getlist(self, name):
- return self._wrapped.getall(name)
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