if L==[]:
return (None, None)
else:
Max=L[0]
Min=L[0]
for x in L:
if x>=Max:
Max=x
if x<=Min:
Min=x
return (Min, Max)
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if L==[]:
return (None, None)
else:
Max=L[0]
Min=L[0]
for x in L:
if x>=Max:
Max=x
if x<=Min:
Min=x
return (Min, Max)