if(len(L)==0):
return(None,None)
max=min=L[0]
for a in L:
if(a<min):
min=a
if(a>max):
max=a
return (min, max)
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pipi-hongwy
if(len(L)==0):
return(None,None)
max=min=L[0]
for a in L:
if(a<min):
min=a
if(a>max):
max=a
return (min, max)