在Python中操作字符串之replace()方法的使用

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Release: 2016-06-10 15:12:16
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 replace()方法返回当前old换成new,可选择的替代限制到最大数量的字符串的副本。
语法

以下是replace()方法的语法:

str.replace(old, new[, max])

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参数

  • old -- 这是要进行更换的旧子串。
  • new -- 这是新的子串,将取代旧的子字符串。
  • max -- 如果这个可选参数max值给出,仅第一计数出现被替换。

返回值

此方法返回字符串的拷贝与旧子串出现的所有被新的所取代。如果可选参数最大值给定,只有第一个计数发生替换。
例子

下面的示例演示了replace()方法的使用。

#!/usr/bin/python

str = "this is string example....wow!!! this is really string";
print str.replace("is", "was");
print str.replace("is", "was", 3);

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当我们运行上面的程序,它会产生以下结果:

thwas was string example....wow!!! thwas was really string
thwas was string example....wow!!! thwas is really string

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