if len(L) == 0:
return (None,None)
elif len(L) ==1:
return(L[0],L[0])
else:
max = L[0]
min = L[0]
for i in L:
if max>i:
if min>i:
min = i
max = i
return (min, max)
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if len(L) == 0:
return (None,None)
elif len(L) ==1:
return(L[0],L[0])
else:
max = L[0]
min = L[0]
for i in L:
if max>i:
if min>i:
min = i
else:
max = i
return (min, max)