if L==[]:
return (None,None)
else:
min = L[0]
max = L[0]
for nums in L:
if nums <= min:
min = nums
if nums >= max:
max = nums
return (min, max)
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汤小易UP
if L==[]:
return (None,None)
else:
min = L[0]
max = L[0]
for nums in L:
if nums <= min:
min = nums
for nums in L:
if nums >= max:
max = nums
return (min, max)