if len(L) == 0:
return (None, None)
max = None
min = None
for num in L:
if max == None or num > max:
max = num;
if min == None or num < min:
min = num;
return min, max
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if len(L) == 0:
return (None, None)
max = None
min = None
for num in L:
if max == None or num > max:
max = num;
if min == None or num < min:
min = num;
return min, max