title: How can I draw axis lines inside a plot in Matplotlib?
body: <p>When I plot data using Matplotlib, the axes are always plotted by default as a box framing the plot. Let's say I am plotting data within axis limits <code>-2 &lt; x &lt; 2</code> and <code>-2 &lt; y &lt; 2</code>, but I would like to draw axis lines inside this plot area through the origin, preferably with ticks and tick labels along these axis lines - not along the outer frame.</p>