title: Why is the last statement false? (edx)
body: <pre><code>a = [1,2,3] 
  
  b = a
  a == b
  True
  a is b
  True 
  
  b = a[:]
  a == b
  True
  a is b
  False
  </code></pre>
  <p>Why is the last statement false?
  &quot;b = a[:]&quot; What is the difference of the line from the other line?</p>