获取每个字符出现的次数 [英] Get the number of occurrences of each character

问题描述

给定字符串:

a='dqdwqfwqfggqwq'

如何获取每个字符出现的次数?

How do I get the number of occurrences of each character?

推荐答案

效率不高，但是是单行的...

Not highly efficient, but it is one-line...

In [24]: a='dqdwqfwqfggqwq'

In [25]: dict((letter,a.count(letter)) for letter in set(a))
Out[25]: {'d': 2, 'f': 2, 'g': 2, 'q': 5, 'w': 3}

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