计算字符串中某个字符出现的次数 [英] Count the number of occurrences of a character in a string
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问题描述
计算字符串中某个字符出现次数的最简单方法是什么?
例如计算'a'
在'Mary had a little lamb'
中出现的次数.
解决方案
str.count(sub[, start[, end]])
返回
[start, end]
范围内子串sub
的非重叠出现次数.可选参数start
和end
被解释为切片符号.
<预><代码>>>>句子 = '玛丽有一只小羊羔'>>>句子.count('a')4
What's the simplest way to count the number of occurrences of a character in a string?
e.g. count the number of times that 'a'
appears in 'Mary had a little lamb'
.
解决方案
str.count(sub[, start[, end]])
Return the number of non-overlapping occurrences of substring
sub
in the range[start, end]
. Optional argumentsstart
andend
are interpreted as in slice notation.
>>> sentence = 'Mary had a little lamb'
>>> sentence.count('a')
4
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