33 lines
962 B
Markdown
33 lines
962 B
Markdown
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---
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title: String Find Method
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localeTitle: 字符串查找方法
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---
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## 字符串查找方法
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在Python中`find()`字符串中的子字符串有两种选择： `find()`和`rfind()` 。
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每个都将返回找到子字符串的位置。两者之间的区别在于`find()`返回最低位置， `rfind()`返回最高位置。
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可以提供可选的开始和结束参数，以限制在字符串的部分内搜索子字符串。
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例：
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```shell
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>>> string = "Don't you call me a mindless philosopher, you overweight glob of grease!"
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>>> string.find('you')
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6
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>>> string.rfind('you')
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42
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```
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如果未找到子字符串，则返回-1。
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```shell
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>>> string = "Don't you call me a mindless philosopher, you overweight glob of grease!"
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>>> string.find('you', 43) # find 'you' in string anywhere from position 43 to the end of the string
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-1
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```
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更多信息：
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字符串方法[文档](https://docs.python.org/3/library/stdtypes.html#string-methods) 。
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