Hands-On Data Analysis with Pandas

Shading regions

In some cases, the reference line itself isn't so interesting, but the area between two of them is; for this purpose, we have axvspan() and axhspan(). Let's revisit the resistance and support of the Facebook stock. We can use axhspan() to shade the area that falls between the two:

>>> ax = fb.close.plot(title='FB Closing Price')>>> ax.axhspan(support, resistance, alpha=0.2)>>> plt.ylabel('Price ($)')

This results in the following plot:

The color of the rectangle is determined by the facecolor argument.

When we are interested in shading the area between two curves, we can use plt.fill_between() and plt.fill_betweenx(). Let's ...