常用模块之collections模块

collections模块

1.ametuple   具名元组
 """
    namedtuple('名称',[名字1,名字2,...])
    namedtuple('名称','名字1 名字2 ...')
 """

2.queue        内置队列模块(解释器自带) # 内置队列模块:FIFO
 import queue
    q = queue.Queue()  # 初始化队列
    q.put('添加内容')  #往队列中添加元素
    #从队列中获取元素
    print(q.get())  # 值去没了则原地等待
    
3.deque        双端队列模块
from collections import deque
    q = deque([11,22,33])
    q.append(44)  # 从右边添加
    q.appendleft(55)  # 从左边添加
    print(q.pop())  # 从右边取值
    print(q.popleft())  # 从做边取值
    
4.orderedDict  有序字典
from collections import OrderedDict
    order_dict = OrderedDict([('name', 'lili'), ('age', 17)])
    order_dict['hobby'] = 'read'
    print(order_dict)
    
5.defaultdict  默认字典
from collections import defaultdict
values = [11, 22, 33,44,55,66,77,88,99,90]
my_dict = defaultdict(list)
for value in values:
    if value > 60:
        my_dict['k1'].append(value)
    else:
        my_dict['k2'].append(value)
print(my_dict)

6.counter         计数器
 from collections import Counter  # 计数器
 res = 'hellohello' 
 res = Counter(res)
    # ({'l': 4, 'h': 2, 'e': 2, 'o': 2})
```