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看完大家写的,发现我是最笨的

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#1 Created at ... [Delete] [Delete and Lock User]
    cnt = 0
    for i in s:
        if i == ' ':
           cnt = cnt+1
        else:
           break

    s = s[cnt:]
    
    cnt = 0
    for i in reversed(s):
        if i == ' ':
            cnt = cnt+1
        else:
            break
        
    s = s[:len(s)-cnt]
    return s

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