local setup

create folder name flask_project

1. windows - 
#run - pip install virtualenvwrapper-win 
(URL - https://www.liquidweb.com/kb/how-to-setup-a-python-virtual-environment-on-windows-10/)
#run - virtualenv venv
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linux - python3 -m venv venv

#run - venv\Scripts\activate

install flask

#run - pip install flask
#run - create requirements.txt
#run - pip freeze > requirements.txt

run application

#run - python app.py
URL - http://127.0.0.1:5000/

deactivate virtual environment

#run - deactivate

install dependency

#run - pip install -r requirements.txt

uninstall dependency

#run - pip uninstall -r requirements.txt