Fixed #6465 -- Tweaked MergeDict.getlist() to work with Django's...

    """

    A simple class for creating new "virtual" dictionaries that actually look

    up values in more than one dictionary, passed in the constructor.

    If a key appears in more than one of the passed in dictionaries, only the

    first occurrence will be used.

    """

    def __init__(self, *dicts):

        self.dicts = dicts

    def getlist(self, key):

        for dict_ in self.dicts:

            try:

            if key in dict_.keys():

                return dict_.getlist(key)

            except KeyError:

                pass

        raise KeyError

        return []

    def items(self):

        item_list = []

>>> md2['chris']

'cool'

MergeDict can merge MultiValueDicts

>>> multi1 = MultiValueDict({'key1': ['value1'], 'key2': ['value2', 'value3']})

>>> multi2 = MultiValueDict({'key2': ['value4'], 'key4': ['value5', 'value6']})

>>> mm = MergeDict(multi1, multi2)

# Although 'key2' appears in both dictionaries, only the first value is used.

>>> mm.getlist('key2')

['value2', 'value3']

>>> mm.getlist('key4')

['value5', 'value6']

>>> mm.getlist('undefined')

[]

### MultiValueDict ##########################################################

>>> d = MultiValueDict({'name': ['Adrian', 'Simon'], 'position': ['Developer']})