title: change matplotlib axis settings
body: <p>How do I get control over the axis settings of a pyplot plot. I have simply done</p>
  
  <pre><code>    pylab.plot(*self.plot_generator(low, high))
  
      pylab.show()
  </code></pre>
  
  <p>and I get this which is what I want</p>
  
  <p><img src="https://i.stack.imgur.com/7fLWz.png" alt="alt text"></p>
  
  <p>but I want the x axis to be at 0 instead of at the bottom. How would I do that?</p>