if L==[]:
return((None,None))
else:
x=L[0]
y=L[0]
for i in L:
if x>i:
x=i
elif y<i:
y=i
return((x,y))
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且看风吟0
if L==[]:
return((None,None))
else:
x=L[0]
y=L[0]
for i in L:
if x>i:
x=i
elif y<i:
y=i
return((x,y))