Create a venv

python -m venv venv/

or if You have multiple python version installed

py -3.11 -m venv venv/

Activate the venv

.\venv\Scripts\activate

install this

pip install flask gunicorn tweepy

Create a requirements.txt

pip freeze > requirements.txt

Create a Procfile & add this in the file (for heroku host)

web: gunicorn greeting:app

Now use any hosting you want.