Many Matplotlib plots support arrays as input and in particular, they support NumPy arrays. The NumPy library is the most widely-supported means for supporting numeric arrays in Python.

Notebook-based python tutorials at Wellesley College - jbattat/Python-Tutorials ...

In this course, you will learn to use Matplotlib to plot data in Python. You will learn to produce several types of plot, how to arrange multiple plots into an array of subplots, and how to save plots ...

Arrays are super useful. If you want even more details about python and arrays - this is a very useful site from Cornell. My python-foo will probably never catch up with The Virtuosi.