python + matplotlib: How to make XTick Markers symmetric over the axis?

Question

on a normal matplotlib's plot, how can I format the tick markers of the x axis to "cut" the axis symmetrically?

Standard, it is like this:

I want them like this:

Any idea?

Thanks

Answer 1

I think you're looking for the ticks parameters.

 matplotlib.axes.tick_params(direction='inout')