if L==[]:
return (None,None)
else:
max=L[0]
min=max
for x in L:
if x>max:
max=x
for y in L:
if y<min:
min=y
return (min,max)
厉害,清晰明了
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微笑的叶蓝秋
if L==[]:
return (None,None)
else:
max=L[0]
min=max
for x in L:
if x>max:
max=x
for y in L:
if y<min:
min=y
return (min,max)