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交作业

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轩辕泽霖

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

    if len(s)>0 and s=='':

        return s

    while len(s)>0 and s[0]==' ':

        s= s[1:]

    while len(s)>0 and s[-1]==' ':

        s = s[:-2]

    return s

轩辕泽霖

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

if len(s)==0 or s==' ':

        return s

    while len(s)>0 and s[0]==' ':

        s= s[1:]

    while len(s)>0 and s[-1]==' ':

        s = s[:-2]

    return s

轩辕泽霖

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

lens = len(s)

    if lens == 0 or s == ' ':

        return s

    l=lens

    for i in range(lens):

        if s[i] !=' ':

           l = i

           break

    if l == lens:

        s =''

    else:

        for i in range(lens):

            if s[-i-1] !=' ':

                s = s[l:-i+lens] 

                break

    return s


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