4.12 从今天开始是python

point：用setdefault（）方法计算字符串中每个字符出现的次数 +漂亮打印

代码：

import pprint
message='It was a bright cold dayin April,and the clocks were striking thirteen.'
count={}
for character in message:
    count.setdefault(character,0)
    count[character]=count[character]+1
pprint.pprint(count)