$ pip install -r requirements.txt

$ python main.py

$ python -m unittest test_calc.py -v
$ python -m unittest discover -v 

$ coverage run src/main.py
$ coverage run test_calc.py
$ coverage report
$ coverage html
$ open htmlcov/index.html

$ docker build -t mario21ic/pycalc:v1.0 .
$ docker run -p 8080:8080 mario21ic/pycalc:v1.0

$ docker-compose up