create folder
cd into folder
pip install virtualenv
virtualenv venv
venv\Scripts\activate
venv\Scripts\python.exe -m pip install --upgrade pip
pip install flask
pip freeze > requirements.txt
create folder
cd into folder
pip install virtualenv
virtualenv venv
venv\Scripts\activate
venv\Scripts\python.exe -m pip install --upgrade pip
pip install flask
pip freeze > requirements.txt