title: Changing a value in a list of lists
body: <p>The following Python 3 code creates a list of lists but when you attempt to change a particular value, the value corresponding to row 2 and column 1, each of the corresponding values in the remaining lists is changed. How do you only change the specified value?</p>
  <pre><code>list_of_num = [[0,0]] * 4
  print('List of lists:')
  print(list_of_num)
  list_of_num[1][0] = 1 
  print('List of lists:')
  print(list_of_num)
  </code></pre>