Plotting a simple sales graph

In this recipe, we'll see how to draw a sales graph by drawing bars proportional to sales in different periods.

Getting ready

We can install matplotlib in our virtual environment using the following commands:

$ echo "matplotlib==3.2.1" >> requirements.txt
$ pip install -r requirements.txt

In some OSes, this may require us to install additional packages; for example, in Ubuntu, it may require us to run apt-get install python3-tk. Check the matplolib documentation for details.

If you are using macOS, it's possible that you'll get an error like this: RuntimeError: Python is not installed as a framework. Refer to the matplotlib documentation on how to fix it: https://matplotlib.org/faq/osx_framework.html.

How to do it...

1. Import matplotlib:

   >>> import matplotlib.pyplot as plt
   

2. Prepare the data to be displayed on the graph:

   >>> DATA = (
   ...    ...