To plot graphs in Python you can use popular library Matplotlib. I would recommend creating separate virtual environment and then installing matplotlib.
Installing matplotlib in Virtual Environment
Create virtual environment using following command
virtualenv ~/.venvs/matplotlib
Activate virtual environment
. ~/.venvs/matplotlib/bin/activate
Install Matplotlib
pip install matplotlib
Graphing Parabola
Below code will graph simple parabola y = x2. Range of function would be (-50, 50).
import matplotlib.pyplot as plt
x_cords = range(-50,50)
y_cords = [x*x for x in x_cords]
plt.scatter(x_cords, y_cords)
plt.show()