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Installing Flask

With your virtual environment activated, you can now install Flask using pip. Flask is a small library, but it also installs a few dependencies like Werkzeug and Jinja2.

Install Flask

pip install flask

Verify Installation

flask --version
You should see Flask version and its dependencies (Werkzeug, Jinja2, click).

What Gets Installed?

  • Flask: the main framework.
  • Werkzeug: a WSGI utility library (handles requests/responses).
  • Jinja2: templating engine for HTML.
  • click: for command‑line interface.

Freezing Dependencies (Optional)

To save your exact package versions for later (or for sharing), run:
pip freeze > requirements.txt


Two Minute Drill
  • Install Flask with `pip install flask`.
  • Verify with `flask --version`.
  • Flask automatically installs Werkzeug, Jinja2, and click.
  • Use `pip freeze > requirements.txt` to save dependencies.

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