if L==[]:
return (None,None)
else:
min=L[0]
max=L[0]
for i in L:
if i<min:
min=i
if i>max:
max=i
return (min,max)
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独孤泠然July
if L==[]:
return (None,None)
else:
min=L[0]
max=L[0]
for i in L:
if i<min:
min=i
if i>max:
max=i
return (min,max)