if len(L)==0:
return(None,None)
else:
c=(0)
b=(10)
for n in L:
if n>c:
c=n
if n<b:
b=n
return(b,c)
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杨森-ys
if len(L)==0:
return(None,None)
else:
c=(0)
b=(10)
for n in L:
if n>c:
c=n
if n<b:
b=n
return(b,c)