if len(L)==0:
return (None, None)
min=max=L[0]
for a in L:
if a<min:
min=a
elif a>max:
max=a
return (min, max)
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if len(L)==0:
return (None, None)
min=max=L[0]
for a in L:
if a<min:
min=a
elif a>max:
max=a
return (min, max)