Displaying multiple lines

This recipe will show you how to display multiple lines in a graph.

Getting ready

We need to install matplotlib in our virtual environment:

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

If you are using macOS, you may get an error like this: RuntimeError: Python is not installed as a framework. See 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. This represents two products' sales:

   >>> DATA = (
   ...     ('Q1 2017', 100, 5),
   ...     ('Q2 2017', 105, 15),
   ...     ('Q3 2017', 125, 40),
   ...     ('Q4 2017', 115, 80),
   ... )
   

3. Process the data to prepare the expected format:

   >>> POS = list(range(len(DATA)))
   >>> VALUESA ...