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==2.2.2" >> 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 docs 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. See the matplolib documentation on how to fix it: https://matplotlib...