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交作业，这样很简洁

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YIUCHIMAN

#1 Created at ... [Delete] [Delete and Lock User]

    while s[:1]==" ":

       s=s[1:]

    while s[-1:]==" ":

       s=s[:-2]

    return s

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#2 Created at ... [Delete] [Delete and Lock User]

第二个循环里应该是s=s[:-1]吧，-2的话少判断了一位？

别叫雨薇叫奶茶丶

#3 Created at ... [Delete] [Delete and Lock User]

s=s[:-2]才去掉最后的空格啊

大灰灰69223

#4 Created at ... [Delete] [Delete and Lock User]

是s = s[:-1]，-2直接干掉了两位，包前不包后

def trim(s):    while True:        if s.startswith(" "):            s = s[1:]        elif s.endswith(" "):            s = s[:-1]        else:            break    return s
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