You can also make your own polygons by specifying where those vertices lie. In the following code, we can see that there are four vertices corresponding to a trapezoid, as follows:

# Making your own polygons
pos = [(3,0),(7,0), (6,1), (4,1)]
poly = mpl.patches.Polygon(pos)
plt.plot(nums, 10/3.*np.sin(nums))
plt.gca().add_patch(poly)

When we run this code, we get a trapezoid, as shown here:

Matplotlib provides the ability to build much more complicated and sophisticated shapes using paths. It is recommended to take a look at the matplotlib.path module. In the path module, we can see that there is a module available for dealing with multiple different kinds of lines. By combining these different lines—straight lines, Bezier curves, and other lines—we can build any kind of shape that we want:

mpl.path?

We will get the following screen:

In fact, Matplotlib provides a language similar to SVG, where we can build sophisticated vector graphics.