title: Bad variable assigment in PYTHON
body: <p>Line 6 is a variable assigment and it does not work.... <strong>why?</strong></p>
  <p>I do not see the mistake</p>
  <pre><code>aleatorio = [11,2,5,9,3,4,8,13,7]
  longitud = len(aleatorio)
  contador = 0
  
  for i in range(longitud-1):
    a = aleatorio[i]
    b = aleatorio[i + 1]
    print(a, b, i, i + 1)
    if a &lt; b:
      contador = contador + 1 
    else:
      c = aleatorio[i]
      d = aleatorio[i+1]
      aleatorio[i] = d
      aleatorio[i+1] = c
  print(aleatorio)
  </code></pre>
  <p>it prints:</p>
  <pre><code>11 2 0 1
  11 5 1 2
  11 9 2 3
  11 3 3 4
  11 4 4 5
  11 8 5 6
  11 13 6 7
  13 7 7 8
  [2, 5, 9, 3, 4, 8, 11, 7, 13]
  </code></pre>