python自定义一个字符串替换的函数

"""
作者：皮蛋编程(https://www.pidancode.com)
创建日期：2022/3/21
功能描述：python自定义一个字符串替换的函数
"""
Escape = "^"


def subst(Msg, *Args):
    """substitutes Args into Msg."""
    Result = ""
    while True:
        Items = Msg.split(Escape, 1)
        Result += Items[0]
        if len(Items) == 1 or len(Items[1]) == 0:
            break
        Msg = Items[1]
        (Ch, Msg) = (Msg[:1], Msg[1:])
        if Ch == Escape:
            Result += Escape
        elif Ch >= "0" and Ch <= "9":
            Result += Args[ord(Ch) - ord("0")]
    return Result

print(subst("the ^0 ^1", "red", "ball"))
# 输出结果：“the red ball”