if len(L)==0:
max=min=None
else:
max=L[0]
min=L[0]
for i in L:
if i>max:
max=i
if i<min:
min=i
return (min, max)
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静谧_聒噪_心
if len(L)==0:
max=min=None
else:
max=L[0]
min=L[0]
for i in L:
if i>max:
max=i
for i in L:
if i<min:
min=i
return (min, max)