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交作业

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#1 Created at ... [Delete] [Delete and Lock User] 
def trim(s):
    i1 = 1    i2 = len(s)
    while s[:i1] == ' ' * i1:
        i1 = i1 + 1    while s[i2-1:] == ' ' * (len(s)-i2+1):
        i2 = i2 - 1    s = s[i1-1:i2]
    return s

def trim(s):    i1 = 1    i2 = len(s)    while s[:i1] == ' ' * i1:        i1 = i1 + 1    while s[i2-1:] == ' ' * (len(s)-i2+1):        i2 = i2 - 1    s = s[i1-1:i2]    return s
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