if L==[]:
return(None,None)
else:
max=min=L[0]
for i in L:
while i>=max:
max=i
while i<=min:
min=i
return(min,max)
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雅乐landa
if L==[]:
return(None,None)
else:
max=min=L[0]
for i in L:
while i>=max:
max=i
while i<=min:
min=i
return(min,max)