#PLY simple algebra calc

Installation:

1. create virtualenv: virtualenv .virtualenv -p python3 && source .virtualenv/bin/activate
2. install dependencies: pip3 install -r requirements.txt
3. run interpreter: ./shell.py

Running tests

1. create virtualenv: virtualenv .virtualenv -p python3 && source .virtualenv/bin/activate
2. install dependencies: pip3 install -r requirements.txt
3. run pytest: py.test