if len(L)==0:
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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芳芳郁金香0205
if len(L)==0:
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)