le=len(L)
if le==0:
return(None, None)
elif le==1:
return(L[0], L[0])
else:
max=L[0]
min=L[0]
for n in L:
if n>max:
max=n
if n<min:
min=n
return(min,max)
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leo咕咕白
le=len(L)
if le==0:
return(None, None)
elif le==1:
return(L[0], L[0])
else:
max=L[0]
min=L[0]
for n in L:
if n>max:
max=n
if n<min:
min=n
return(min,max)