python3 -m venv python_modules          # create python environment
source ./python_modules/bin/activate    # activate python environment
python3 -m pip install -r package-lock.txt   # install python modules from package.txt
deactivate                              # deactivate python environment

ppm install

source ./python_modules/bin/activate    # activate python environment
python main.py                          # run back-end server
deactivate                              # deactivate python environment

ppm start

source ./python_modules/bin/activate    # activate python environment
pip install new-package				# install new-package
python -m pip freeze > package-lock.txt		# save new-package to package.txt
deactivate                              # deactivate python environment

ppm install new-package

mkdir backend
cd backend
python3 -m venv python_modules          # create python environment
source ./python_modules/bin/activate    # activate python environment
pip install flask flask-cors     		# install essitial modules
python -m pip freeze > package-lock.txt		# save dependencies to package.txt
deactivate                              # deactivate python environment

mkdir backend
cd backend
ppm install
ppm install flask flask-cors           # install essitial modules