if len(L) == 0 :
return (None, None)
min=max=L[0]
for x in L:
if min > x:
min= x
elif max < x:
max = x
return (min,max)
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吃不瘦的胖子201811
if len(L) == 0 :
return (None, None)
min=max=L[0]
for x in L:
if min > x:
min= x
elif max < x:
max = x
return (min,max)