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我竟然把L==None害我半天没搞懂怎末回事！！！

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射手再见蓝天575

#1 Created at ... [Delete] [Delete and Lock User] 
 if L==[]:
        return (None,None)
     else:
        t1=L[0]
        t2=L[0]
        for i in L:
           if i<t1:
              t1=i
           if i>t2:
              t2=i
        return (t1,t2)
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