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