if len(L) == 0:
return (None, None)
else:
a = [L[0], L[0]]
for i in L:
if i < a[0]:
a[0] = i
elif i > a[1]:
a[1] = i
return (a[0], a[1])
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just!smile
if len(L) == 0:
return (None, None)
else:
a = [L[0], L[0]]
for i in L:
if i < a[0]:
a[0] = i
elif i > a[1]:
a[1] = i
return (a[0], a[1])