if L==[]:
return (None, None)
else:
m,n=L[0],L[0]
for x in L:
m=min(m,x)
n=max(n,x)
return m, n
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shoppingxi
if L==[]:
return (None, None)
else:
m,n=L[0],L[0]
for x in L:
m=min(m,x)
n=max(n,x)
return m, n