title: How to change the amount of increments in pyplot axis
body: <p>Hi probably quite a simple question but.. <br>
  When plotting a graph using matplotlib.pyplot my Y axis goes from -0.04 to 0.03 which is fine but there are 8 labels for increments (eg 0.03,0.02,0.01 etc.). I need more maybe 16 or so.</p>
  
  <p>Thanks for your help</p>