title: Pylab / Matplotlib Graphing
body: <p>I need to create a graph in Pylab in which I will plot colored points along the Y axis. 
  The y axis goes from 0 to 100.
  I also have a list of 100 elements, and the elements are either +1 or -1.
  This list has to correspond with the Y axis of the graph.</p>
  
  <p>For instance, if the fifth element in the list is +1, I need to plot a green dot on y=5 on the Y axis. if the fifth element in the list is -1, the point has to be red.</p>
  
  <p>I have to do this for all elements in the list.</p>
  
  <p>I have graphed simple graphs in Pylab, but I am totally lost in this case.
  Any help will be appreciated. Thanks!!</p>