Python 字典的基本 *** 作 题目练习

统计句子“Life is short，we need Python.”中各字符出现的次数。

s='Life is short，we need Python.'
s=s.lower()
print(s)
dic={}
for a in s:
    dic[a] = dic.get(a,0) + 1
for  k in dic:
    print(k,dic[k])