if L:
a = L[0]
b = L[0]
for x in L:
if x > a:
a = x
if x < b:
b = x
return (b, a)
else:
return (None, None)
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_JasonTong
if L:
a = L[0]
b = L[0]
for x in L:
if x > a:
a = x
if x < b:
b = x
return (b, a)
else:
return (None, None)