Flask
A small, explicit Python web framework.
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This course has 3 lessons. Start with the first one and use the next / previous links at the bottom of each lesson — the sidebar keeps the whole course in order.
Lessons
- Your first Flask appRoutes, view functions, the development server, and how Flask decides which function handles a request.
- Templates with Jinja2Passing data into templates, inheritance with blocks, escaping (and the one line that disables it).
- Forms, sessions and errorsReading request data, validating it, flashing messages, keeping a session, and returning sensible error responses.
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Last refreshed 2026-09-17.