在Python中操作字符串之replace()方法的使用
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])
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);
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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