```
if L == []:
return(None, None)
else:
max = L[0]
min = L[0]
for x in L[1:]:
if x > max:
max = x
elif x < min:
min = x
return(min, max)
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阿羊羽
```
if L == []:
return(None, None)
else:
max = L[0]
min = L[0]
for x in L[1:]:
if x > max:
max = x
elif x < min:
min = x
return(min, max)
```