title: Assign random nubers to a zero matrix
body: <p>I can't run this:</p>
  <pre><code>import pprint
  import random
  
  linii = int(input(&quot;Introdu nr de linii: &quot;))
  coloane = int(input(&quot;Introdu nr de coloane:  &quot;))
  
  m = [[0 for i in range(linii)] for i in range(coloane)]
  
  for i in range(linii):
      for j in range(coloane):
          m[i][j] = random.randint(1, 9999)
  
  pprint.pprint(m)
  </code></pre>
  <p>This is the error
  Traceback (most recent call last):
  File &quot;C:&quot;, line 11, in 
  m[i][j] = random.randint(1, 9999)
  IndexError: list assignment index out of range</p>
  <p>Can you help me?</p>