了解一下python内建模块collections

from collections import Counter

c = Counter("HelloKitty")

print(c)

#运行结果：
Counter({'l': 2, 't': 2, 'H': 1, 'e': 1, 'o': 1, 'K': 1, 'i': 1, 'y': 1})

from collections import Counter

c = Counter(["苹果", "樱桃", 1, 1, 4, 4, 5])

print(c)

#运行结果：
Counter({1: 2, 4: 2, '苹果': 1, '樱桃': 1, 5: 1})

from collections import deque

deque_list = deque(['a', 'b', 'c', 'd'])
deque_list.append('苹果')
deque_list.appendleft('吃')

print(deque_list)

#运行结果：
deque(['吃', 'a', 'b', 'c', 'd', '苹果'])

from collections import OrderedDict

list_a = [(1, "苹果"), (2, "香蕉"), (3, "西瓜"), (4, "芒果")]

order_dict = OrderedDict(list_a)
print(order_dict)

#运行结果：
D:\Daily
λ python whatiscollections.py
OrderedDict([(1, '苹果'), (2, '香蕉'), (3, '西瓜'), (4, '芒果')])