counter

counter是一个计数器，帮助我们对某项数据进行计数，如计算每个人各喜欢多少种颜色

from collections import  Counter
colors ={
    ('yasoob', 'Yellow'),
    ('Ali', 'blue'),
    ('Ali','black'),
    ('ali','white'),
    ('ahemd','silver'),
}
favs = Counter(name for name , color in colors)
print(favs)

找出出现频率最高的数字

list1 = [111,2222,3333,444,555,6,676766,355,35353,42,87,46,5,5,5,5,34343,33,33,3433,3434,878]
print(Counter(list1).most_common(2))
print(Counter(list1)[5]) #查看某个元素出现的次数

[(5, 4), (33, 2)]
还可以和 数学运算符 结合使用

list1 = [111,2222,3333,444,555,6,676766,355,35353,42,87,46,5,5,5,5,34343,33,33,3433,3434,878]
list2 = [6665555,555666]
h1 = Counter(list1)
h2 = Counter(list2)
print(h1 + h2)
print(h1 - h2)

from collections import defaultdict
lists = ['a', 'a', 'b', 5, 6, 7, 5]
count_dict = defaultdict(int)
for item in lists:
    count_dict[item] += 1
print(count_dict)
list2 = [1,1,1,3,3,44,4,5,5,7,8,9,10]
a = Counter(list2)
print(type(a))
print(a)
print(a[5])
list3 = ['lala','koukou','beibei','lala','jj','koukou']
b = Counter(list3)
print(b)
print(b['lala'])
for key in b:
    print(key)

统计计数的简单例子,易懂

最后

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