title: List assignment in python
body: <p>I have a code like below,when i print the list1 and list2 it shows same elements but i have added the 9 after the assignment of existing list1 to list2 so it should not show 9 in list2.</p>
  
  <pre><code>list1=[1,2,3,4]
  list2=list1
  list1.insert(4,9)
  print(list1)
  print(list2)
  </code></pre>
  
  <p>please clear my doubt.</p>