10/12/2025 · 1 min read

To run flask in this project:

• flask run

flask run is enough because real command is : FLASK_APP=app.py flask run

• I have provided application login in app.py in Path environment using export FLASK_APP=app.py

we need to enable debug mode when we’re working on our project and server is watching for changes.

• FLASK_APP=app.py FLASK_DEBUG=1 flask run

To work with python environment:

lsvirtualenv mkvirtualenv first-flask-app workon first-flask-app pip install flask deactivate

install dependencies

Find dependencies of a Project: -pip list

-pip freeze

How to find a current shell is bash or zsh -$ echo $0 -$ echo $SHELL echo $0 is more accurate and if you type bash in zsh shell

To change prompt to include a new line PS1=“$PS1\n”

Uninstall existing versions pip uninstall werkzeug Flask-Login

Reinstall all dependencies pip freeze > requirements.txt

pip install -r requirements.txt