Once your virtual environment is activated, install Flask:

pip install Flask

pip install Flask

Verify installation

You can quickly verify installation in Python:

python -c "import flask; print(flask.__version__)"

python -c "import flask; print(flask.__version__)"

What gets installed?

Flask depends on a few important libraries:

• Werkzeug: request/response handling, dev server
• Jinja2: templating engine
• ItsDangerous: signing cookies
• Click: CLI tooling

You don’t need to learn them all now, but it’s helpful to know what’s underneath.

Pinning versions

For learning projects, installing latest is fine.

For production apps, it’s common to pin versions in requirements.txtrequirements.txt or use a tool like Poetry. (We’ll keep it simple in this tutorial track.)