python统计list各元素出现的次数

1. 方法一：字典统计

a = ['apple', 'orange', 'apple', 'dog', 'cat', 'dog']
dict = {}
for key in a:
    dict[key] = dict.get(key, 0) + 1
print(dict)

{‘apple’: 2, ‘orange’: 1, ‘dog’: 2, ‘cat’: 1}

2. 方法二：collection包下Counter类统计

from collections import Counter
a = ['apple', 'orange', 'apple', 'dog', 'cat', 'dog']
result = Counter(a)
print(result)
print (type(result))

Counter({‘apple’: 2, ‘dog’: 2, ‘orange’: 1, ‘cat’: 1})

参考链接：[https://www.cnblogs.com/keye/p/9720694.html](https://www.cnblogs.com/keye/p/9720694.html)