if len(L)!=0:
min=L[0]
max=L[0]
for i in L:
if min>i:
min=i
if max<i:
max=i
return (min,max)
else:
return (None, None)
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1090
if len(L)!=0:
min=L[0]
max=L[0]
for i in L:
if min>i:
min=i
if max<i:
max=i
return (min,max)
else:
return (None, None)