计算字符串中字符的出现次数 [英] Count occurrence of a character in a string

问题描述

计算字符串中字符出现次数的最简单方法是什么？

What's the simplest way to count the number of occurrences of a character in a string?

例如。计数中出现'a'的次数'玛丽有一只小羊'

推荐答案

str.count（sub [，start [，end]]）

返回不重叠的次数在 [start，end] 范围内的 sub 可选参数开始和结束解释为片段符号。

Return the number of non-overlapping occurrences of substring sub in the range [start, end]. Optional arguments start and end are interpreted as in slice notation.

>>> sentence = 'Mary had a little lamb'
>>> sentence.count('a')
4

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