</pre><pre name="code" class="python">L = []
s = [0,0,0]
for i in range(3):
L.append(s)
L[1][1]=1
print L
</pre><pre name="code" class="python">L = []
s </pre><pre name="code" class="python">L = []
s = [0,0,0]
for i in range(3):
L.append(s)
L[1][1]=1
print L
</pre><pre name="code" class="python">L = []
s