python中元素序列的频数

from random import randint
d = dict.fromkeys(data, 0)
for x in data:
    d[x] += 1
res = sorted(c.items(),key= lambda x:x[1],reverse=True)
for x in range(3):
    print(res[x])

from collections import Counter
c2 = Counter(data)#一个字典与上面的d相同，只是已经统计好词频
res = c2.most_common(3)#most_common返回频度最高的n个元素
print(res)