if len(L)==0:
return (None, None)
else:
a=b=L[0]
for i in L:
if i>=a:
a=i
if i<=b:
b=i
return (b,a)
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天沢
if len(L)==0:
return (None, None)
else:
a=b=L[0]
for i in L:
if i>=a:
a=i
if i<=b:
b=i
return (b,a)