if 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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胆小的魔术师
if 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