Python替换String中某些字符的替代方法

Question

我有“hihwru”，我想用“oware”替换“wr”，而不使用Python中的replace方法。

以下是我的代码：

def Rep(str,chr,Rchr):
    if chr in str:
        str1=str.replace(chr,Rchr)
        print(str1)
    else:
        print("character is not present in the string to replace")

Rep("Hihwru","wr","oware")

我希望这与out replace方法一起使用。我怎么能这样做（使用Python）???

Answer 1

使用RegExp，查看ideOne

import re

def Rep(str,chr,Rchr):
    if chr in str:
        str1 = Rchr if chr else None
        result = re.sub(chr, str1, str)
        print(result)
    else:
        print("character is not present in the string to replace")

Rep("Hihwru","wr","oware")