计算字符串中字符的出现次数 [英] Count the number occurrences 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?

例如计算'a'在'Mary有点羊羔' $ p $中出现的次数b

e.g. count the number of times 'a' appears in 'Mary had a little lamb'

推荐答案

str.count（sub [，start [，end]]）

返回子字符串<$ c不重叠的次数$ c> sub 在 [开始，结束] 范围内。可选参数 start 和 end 被解释为切片符号。

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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