title: Python matplotlib - setting x-axis scale
body: <p>I have this graph displaying the following:</p>
  
  <pre><code>plt.plot(valueX, scoreList)
  plt.xlabel("Score number") # Text for X-Axis
  plt.ylabel("Score") # Text for Y-Axis
  plt.title("Scores for the topic "+progressDisplay.topicName)
  plt.show()
  </code></pre>
  
  <p>valueX = [1, 2, 3, 4] and
  scoreList = [5, 0, 0, 2]</p>
  
  <p>I want the scale to go up in 1's, no matter what values are in 'scoreList'. Currently get my x-axis going up in .5 instead of 1s.</p>
  
  <p>How do I set it so it goes up only in 1?</p>