if L == []:
return (None, None)
else:
min = max = L[0]
for i in L:
if i < min:
min = i
elif i > max:
max = i
return (min, max)
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狼叔叔
if L == []:
return (None, None)
else:
min = max = L[0]
for i in L:
if i < min:
min = i
elif i > max:
max = i
return (min, max)