if len(L)==0:
return(None,None)
elif len(L)==1:
return(L[0],L[0])
else:
max=L[1]
min=L[1]
for a in L:
if a>=max:
max=a
if a<=min:
min=a
return(min, max)//注意return不要在循环内
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一颗美美哒心
if len(L)==0:
return(None,None)
elif len(L)==1:
return(L[0],L[0])
else:
max=L[1]
min=L[1]
for a in L:
if a>=max:
max=a
if a<=min:
min=a
return(min, max)//注意return不要在循环内