Python Collections

import collections
dir(collections)
>>['Callable', 'Container', 'Counter', 'Hashable', 
'ItemsView', 'Iterable', 'Iterator', 'KeysView', 
'Mapping', 'MappingView', 
'MutableMapping', 'MutableSequence', 'MutableSet', 
'OrderedDict', 'Sequence', 'Set', 'Sized', 'ValuesView', 
'__all__', '__builtins__', '__doc__', '__file__', '__name__', '__package__', '_abcoll', '_chain', '_class_template', '_eq', '_field_template', '_get_ident', 
'_heapq', '_imap', '_iskeyword', '_itemgetter', 
'_repeat', '_repr_template', '_starmap', '_sys', 
'defaultdict', 'deque', 'namedtuple']

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