collections

all

collections

This module implements specialized container datatypes providing alternatives to Python's general purpose built-in containers, dict, list, set, and tuple.

• 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

deque

双端队列，官方文档介绍

list-like container with fast appends and pops on either end 一个类似列表的容器，能够在两端快速增删的容器

import collections

dq=collections.deque()

dq.append(0)
dq.append(0)
print(dq)

dq.appendleft(1)
dq.append(2)
print(dq)