if len(L) == 0:
return (None, None)
else:
max=min=L[0]
for i in L:
if i < min:
min = i
if i > max:
max = i
return(min,max)
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與生懼來
if len(L) == 0:
return (None, None)
else:
max=min=L[0]
for i in L:
if i < min:
min = i
if i > max:
max = i
return(min,max)