为什么下面的代码返回空字符串（“”）？

Question

我不明白当你输入单词“pandemonium”时，它怎么会返回一个空字符串（“”）。有人能解释这是为什么吗

def mystery(text):
    result = ""
    for x in text:
        if x == "p":
            result += "pop"
        elif x == "m":
            result = ""
        else:
            result += x
    return result

Answer 1

这是因为当x == "m"你重置result变量为等于一个空字符串而不是附加它

def mystery(text):
    result = ""
    for x in text:
        if x == "p":
            result += "pop"
        elif x == "m":
            result += ""
        else:
            result += x
    return result