if L==[]:
max=min=None
return(min,max)
else:
min = max = L[0]
for x in L:
if x > max:
max = x
if x < min:
min = x
return(min, max)
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牧殇3399
if L==[]:
max=min=None
return(min,max)
else:
min = max = L[0]
for x in L:
if x > max:
max = x
if x < min:
min = x
return(min, max)