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Python中的rfind()方法使用详解

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Release： 2016-06-10 15:12:15
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 rfind()方法返回所在子str 被找到的最后一个索引，或者-1，如果没有这样的索引不存在，可选择限制搜索字符串string[beg:end].
语法

以下是rfind()方法的语法：

str.rfind(str, beg=0 end=len(string))
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参数

  • str -- 此选项指定要搜索的字符串
  • beg -- 这是开始索引，默认情况下为 0
  • end -- 这是结束索引，默认情况下它等于该字符串的长度

返回值

此方法如果找到返回最后一个索引，否则返回-1
例子

下面的例子显示了rfind()方法的使用

#!/usr/bin/python

str = "this is really a string example....wow!!!";
str = "is";

print str.rfind(str);
print str.rfind(str, 0, 10);
print str.rfind(str, 10, 0);

print str.find(str);
print str.find(str, 0, 10);
print str.find(str, 10, 0);
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当我们运行上面的程序，它会产生以下结果：

5
5
-1
2
2
-1
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Related labels：
python
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