if not L:
return (None, None)
min = max = L[0]
for n in L:
if n < min:
min = n
elif n > max:
max = n
return (min, max)
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。
if not L:
return (None, None)
min = max = L[0]
for n in L:
if n < min:
min = n
elif n > max:
max = n
return (min, max)