if L == []:
return (None, None)
else:
for min in L:
for x in L:
if x < min:
min = x
for max in L:
for y in L:
if y > max:
max = y
return (min, max)
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崆峒奇兵
if L == []:
return (None, None)
else:
for min in L:
for x in L:
if x < min:
min = x
for max in L:
for y in L:
if y > max:
max = y
return (min, max)