title: How do I initialize a column vector of a 2D list/array in python?
body: <p>Suppose I have a list of list called <code>mat</code> of shape <code>5x5</code>. </p>
  
  <p>Then I initialize a "column", element by element as follows</p>
  
  <pre><code>mat[0][4] = 'X'
  mat[1][4] = 'O'
  mat[2][4] = 'R'
  mat[3][4] = 'N'
  mat[4][4] = 'A'
  </code></pre>
  
  <p>Is there any way to initialize this column vector in one line in <code>Python</code> like how <code>MATLAB</code> might do?</p>
  
  <pre><code>mat[:,4] = ['X','O','R','N','A']
  </code></pre>