After plotting financial data, I would like to get the current X and Y axes values, in order to plot, for instance, an additional arrow.

So far I got pretty close; lets say the figure is stored in "plt"
If we do:
plt.gca().get_xticks()
plt.gca().get_yticks()
We get the ticks currently drawn in the figure:
[ 732000.,  732020.,  732040.,  732060.,  732080.,  732100., 732120.,  732140.,  732160.]
[ 0.9 ,  0.91,  0.92,  0.93,  0.94,  0.95,  0.96,  0.97,  0.98]
But how could we get the coordinates of, for instance, the last visible bar? and of the previous one?
 
    