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An ordered dictionary that can have multiple values for each key.
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>>> d = MultiDict(a=1, b=2)
>>> d['a']
1
>>> d.getall('c')
[]
>>> d.add('a', 2)
>>> d['a']
1
>>> d.getall('a')
[1, 2]
>>> d['b'] = 4
>>> d.getall('b')
[4]
>>> d.keys()
['a', 'a', 'b']
>>> d.items()
[('a', 1), ('a', 2), ('b', 4)]
>>> d.mixed()
{'a': [1, 2], 'b': 4}
>>> MultiDict([('a', 'b')], c=2)
MultiDict([('a', 'b'), ('c', 2)])
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