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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