if len(L)==0:
return (None, None)
else:
Max=Min=L[0]
for i in L:
if i>=Max:
Max=i
elif i<=Min:
Min=i
return (Min,Max)
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琪琪妈妈0512
if len(L)==0:
return (None, None)
else:
Max=Min=L[0]
for i in L:
if i>=Max:
Max=i
elif i<=Min:
Min=i
return (Min,Max)