if L == []:
return (None, None)
min=L[0]
max=L[0]
for x in L:
if x > max:
max = x
if x < min:
min = x
return (min, max)
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施谷草
if L == []:
return (None, None)
min=L[0]
max=L[0]
for x in L:
if x > max:
max = x
if x < min:
min = x
return (min, max)