06排序输出
fr = open('test.txt' , 'r',encoding='utf-8')
s = fr.read()
s=s.lower()
s=s.replace('\n',' ')
word=s.split(' ')
dic={}
keys=set(word)
for i in keys:
dic[i]=word.count(i)
wc = list(dic.items())
wc.sort(key = lambda x:x[1] ,reverse=True)
for i in range(20):
print(wc[i])