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collections
This module implements specialized container datatypes providing alternatives to Python’s general purpose built-in containers, dict, list, set, and tuple.
Objects Describe namedtuple()
factory function for creating tuple subclasses with named fields deque
list-like container with fast appends and pops on either end ChainMap
dict-like class for creating a single view of multiple mappings Counter
dict subclass for counting hashable objects OrderedDict
dict subclass that remembers the order entries were added defaultdict
dict subclass that calls a factory function to supply missing values UserDict
wrapper around dictionary objects for easier dict subclassing UserList
wrapper around list objects for easier list subclassing UserString
wrapper around string objects for easier string subclassing
初识collections module in Python
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