I couldn’t find a good Python stepper motor interface for the (Big) Easy Driver, so I made one 
https://github.com/tjmarkham/python-stepper
I made it about a year ago but I just got around to uploading it to GitHub. I figured someone might find it useful if they’re trying to use a Raspberry Pi to drive a stepper motor that uses the (Big) Easy Driver or a similar stepper motor driver.
The code utilizes the Step, Direction, and Enable pins on the (Big) Easy Driver to control the stepper.
I tried to make the readme on GitHub as descriptive as possible; if you have any questions about how to use it or how it works, feel free to ask.
-TJ