def findmaxandmin(L):
if L==[] :
return (None, None)
min=max=L[0]
for x in L:
if max<=x:
max = x
if min>=x:
min = x
return(max, min)
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柴哲远
def findmaxandmin(L):
if L==[] :
return (None, None)
min=max=L[0]
for x in L:
if max<=x:
max = x
if min>=x:
min = x
return(max, min)