if len(L) == 0:
return (None, None)
else:
max = L[0]
min = L[0]
for x in L:
if x > max:
max=x
if x < min:
min =x
return (min, max)
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Simms_zh
if len(L) == 0:
return (None, None)
else:
max = L[0]
min = L[0]
for x in L:
if x > max:
max=x
if x < min:
min =x
return (min, max)