假设一个list中保存着各种元素，需要统计每个元素出现的个数，并打印出最常出现的前三个元素分别是什么。list如下：
复制代码 代码如下:
word_list =[is,you,are,i,am,ok,is,ok,she,is,ok,is,i]
方法一(常规方法)：
>>> word_counter ={} >>> for word in word_list: if word in word_counter: word_counter[word] +=1 else: word_counter[word] = 1 >>> popular_word =sorted(word_counter, key = word_counter.get, reverse = true) ) >>> top_3 = popular_word[:3] >>> top_3 ['is', 'ok', 'i']
方法二:适用于python2.7
>>> from collections import counter >>> c = counter(word_list) >>> c.most_common(3)
方法三:
>>> counter ={} >>> for i in word_list: counter[i] = counter.get(i, 0) + 1 >>> sorted([ (freq,word) for word, freq in counter.items() ], reverse=true)[:3] [(4, 'is'), (3, 'ok'), (2, 'i')]
更多python找出list中最常出现元素。