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