Typorithm learning path
Flask: APIs and web applications
Application factories, routing, bounded JSON, pagination, errors, blueprints, Jinja, signed sessions and rotation, Flask-WTF CSRF, SQLAlchemy 2, rollback, Alembic, ownership, pytest, trusted hosts and a notes capstone. Six sections per lesson, retained exercise baselines, two hints and small gradual tasks. Verified with Python 3.13 and Flask 3.1.3. Reading and reasoning checks work in the app; real framework execution uses the downloadable computer lab. CPU only, owned fixtures, no external datasets or production feeds.
Study with a practical destination
Use the linked lessons in order, complete the lab and explain the decisions without the reference. Select the path and depth that match your role.
Flask: a bounded API and owned notes
Before starting: Python foundations and basic HTTP; SQL foundations before the persistence lessons. Reading and reasoning checks work in the app; framework execution uses the isolated pinned computer lab.
Build and explain: Build an application factory with truthful API contracts, signed sessions, CSRF, SQLAlchemy and selected owner-scoped reads.
- 1. Flask: browser-session CSRF protection with Flask-WTF
- 2. Flask: SQLAlchemy 2 models, sessions and selected reads
- 3. Flask: rollback and honest transaction outcomes
- 4. Flask: additive schema changes with Alembic
- 5. Flask: password verification and object ownership
- 6. Flask: pytest fixtures and tests that catch a real regression
- 7. Flask: trusted hosts and production deployment boundaries
- 8. Flask capstone: owned notes from request to selected readback
- 9. Flask: application factories and isolated configuration
- 10. Flask: routes, endpoint names and HTTP methods
- 11. Flask: JSON boundaries, validation and request limits
- 12. Flask: query parameters and bounded pagination
- 13. Flask: response contracts and expected errors
- 14. Flask: blueprints and endpoint namespaces
- 15. Flask: Jinja escaping and explicit empty-value semantics
- 16. Flask: signed sessions, tampering and secret rotation
Review evidence: Attempt the retained small exercise before revealing its solution. Use the two hints, compare observed framework state and run the positive and negative cases. Optional stretches do not block the core. Local fixtures do not establish production readiness or professional certification.
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Module 1 · 1 lessons
Flask: application factories and isolated configuration
Build two independent applications instead of mutating a process-wide singleton.
Module 2 · 1 lessons
Flask: routes, endpoint names and HTTP methods
Generate URLs from endpoint names and keep method policy explicit.
Module 3 · 1 lessons
Flask: JSON boundaries, validation and request limits
Separate media-type errors, malformed JSON, shape validation and bounded input.
Module 4 · 1 lessons
Flask: query parameters and bounded pagination
Treat query strings as untrusted strings and bound each page.
Module 5 · 1 lessons
Flask: response contracts and expected errors
Return truthful statuses and consistent JSON for expected missing resources.
Module 6 · 1 lessons
Flask: blueprints and endpoint namespaces
Organize related routes without confusing a blueprint with an application.
Module 7 · 1 lessons
Flask: Jinja escaping and explicit empty-value semantics
Render untrusted text as text and distinguish missing from empty values.
Module 8 · 1 lessons
Flask: signed sessions, tampering and secret rotation
Understand that default cookie sessions are signed, not encrypted.
Module 9 · 1 lessons
Flask: browser-session CSRF protection with Flask-WTF
Verify a token belongs to the same session before accepting a browser write.
Module 10 · 1 lessons
Flask: SQLAlchemy 2 models, sessions and selected reads
Use mapped columns and explicit ordered queries in an application-scoped session.
Module 11 · 1 lessons
Flask: rollback and honest transaction outcomes
Flush pending writes, inject a controlled failure and verify the surviving state.
Module 12 · 1 lessons
Flask: additive schema changes with Alembic
Preserve an existing row while extending its schema through a migration operation.
Module 13 · 1 lessons
Flask: password verification and object ownership
Separate establishing identity from authorizing a particular resource.
Module 14 · 1 lessons
Flask: pytest fixtures and tests that catch a real regression
Test the response contract rather than merely confirming that a request completed.
Module 15 · 1 lessons
Flask: trusted hosts and production deployment boundaries
Use current host validation and understand what a local client cannot prove.
Module 16 · 1 lessons
Flask capstone: owned notes from request to selected readback
Combine session identity, CSRF, validation, persistence and scoped reads.