def findMinAndMax(L):
if len(L) == 0:
return None, None
min = max = L[0]
for x in L:
if x > max:
max = x
if x < min:
min = x
return min, max
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鸟人子川
def findMinAndMax(L):
if len(L) == 0:
return None, None
min = max = L[0]
for x in L:
if x > max:
max = x
if x < min:
min = x
return min, max