if len(L)==0:
return (None,None)
min = L[0]
max = L[0]
for item in L:
if item>max:
max=item
if item<min:
min=item
return (min,max)
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right-chen
if len(L)==0:
return (None,None)
min = L[0]
max = L[0]
for item in L:
if item>max:
max=item
if item<min:
min=item
return (min,max)