if L==[]:
return (None, None)
else:
b=L[0]
c=L[0]
for i in L:
if i<b:
b=i
if i>c:
c=i
return (b,c)
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if L==[]:
return (None, None)
else:
b=L[0]
c=L[0]
for i in L:
if i<b:
b=i
if i>c:
c=i
return (b,c)