https://docs.python.org/zh-cn/3/library/collections.html
# # Author: Sooele
# import collections
# from collections import deque
# d = deque('ghi')
#
# for elem in d: # iterate over the deque's elements
# print(elem.upper())
#
# Point = collections.namedtuple('Point', ['x', 'y'])
# p = Point(11, y=22)
# p[0] + p[1]
# print(p)
#
# dict = p._asdict()
#
# print(type(dict))
#
# s = p._fields
# print(type(s))
from collections import Counter
mystring = ['a','b','c','d','d','d','d','c','c','e']
# 取得频率最高的前三个值
cnt = Counter(mystring)
cnt.most_common(3)
cnt['b']
print(cnt)
# 命名元组
from collections import namedtuple
Point = namedtuple('Ponit', ['x','y'])
p = Point(10, y=20)
p.x + p.y
p[0] + p[1]
x, y = p
# 双向队列
from collections import deque
d = deque('uvw')
d.append('xyz')
d.appendleft('rst')