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