This project using Python 3.5
Steps for test:
git clone https://github.com/lffsantos/challenge.git
cd challenge
python3 -m venv .virtualenv
source .virtualenv/bin/activate
pip install -r requirements.txt
py.test
Execute Prog2:
cd challenge
python prog2/convert_array_nested_to_flat.py
Execute Prog3
cd challenge
python prog3/invite_customers.py