if L == []:
return (None,None)
else:
min = L[0]
max = L[0]
for i in L[0:len(L)]:
if min >= i:
min = i
if max <= i:
max = i
return (min,max)
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有福气的小羊
if L == []:
return (None,None)
else:
min = L[0]
max = L[0]
for i in L[0:len(L)]:
if min >= i:
min = i
if max <= i:
max = i
return (min,max)