import itertools

import UserDict

def is_dict(value): return hasattr(value, 'keys')

class DictProxy(UserDict.DictMixin):

            except KeyError: pass

        raise # reraise last KeyError

class AttrsDictView:

    '''A dict view of an object's attributes

    @pre If you want __iter__() to work, value must have a __dict__

    def __getitem__(self, key): return getattr(self.value, key)

def make_hashable(value):

    if isinstance(value, list): value = tuple(value)

    elif isinstance(value, dict): value = util.NamedTuple(**value)