Typorithm learning path
FastAPI: practical and tested APIs
ASGI requests, bounded parameters, current form rules, public responses, dependencies, HTTP failures, routing, ownership, lifespan, yield scopes, bounded async work, host/CORS policies, honest pagination, background limits, OpenAPI tests and an owner-scoped capstone. Six substantive sections per topic, short warm-ups and typing, a working exercise baseline, two hints and one small policy change at a time. Verified with Python 3.13 and FastAPI 0.162.0. Reading and reasoning progress work in the app; Python execution uses the downloadable isolated computer lab with owned data and in-process clients.
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.
FastAPI: an owner-scoped tested API
Before starting: Python foundations and basic HTTP; study Pydantic contracts before the FastAPI track. Real execution uses the isolated pinned computer lab.
Build and explain: Build a bounded owner-scoped API and test actual responses, lifecycle, dependency scope and documented contracts.
- 1. A request crosses a real ASGI application
- 2. Bound path and query parameters at their own locations
- 3. Form omission and sibling fields need an explicit policy
- 4. Public response models are a separate boundary
- 5. A dependency graph is cached within one request
- 6. Raise an HTTP failure rather than returning a status tuple
- 7. Static and dynamic routes have an order
- 8. Identity and object ownership are different checks
- 9. Acquire and release application resources with lifespan
- 10. Choose dependency cleanup scope for streaming
- 11. Bound concurrent asynchronous requests
- 12. Host validation and CORS solve different problems
- 13. Filter before limiting and count the same scope
- 14. BackgroundTasks is deferred process work, not a durable queue
- 15. Check OpenAPI against behavior and clean up overrides
- 16. Capstone: an owner-scoped technical-role API
Review evidence: Use a short warm-up, reconstruct one focused decision, then change one policy in a working baseline before opening the solution. Run positive and negative cases; reading progress does not claim professional certification or production readiness.
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Module 1 · 1 lessons
A request crosses a real ASGI application
Observe routing, JSON and status codes through an in-process client.
Module 2 · 1 lessons
Bound path and query parameters at their own locations
Use Annotated, real validation constraints and schema-only metadata deliberately.
Module 3 · 1 lessons
Form omission and sibling fields need an explicit policy
Exercise current boolean defaults and extra-field handling rather than relying on an old checkbox assumption.
Module 4 · 1 lessons
Public response models are a separate boundary
Project an internal record to the fields the caller is allowed to receive.
Module 5 · 1 lessons
A dependency graph is cached within one request
Observe reuse without mistaking it for a global cache.
Module 6 · 1 lessons
Raise an HTTP failure rather than returning a status tuple
Keep missing resources and invalid input distinct from successful JSON.
Module 7 · 1 lessons
Static and dynamic routes have an order
Use APIRouter without letting a generic identifier consume a named operation.
Module 9 · 1 lessons
Acquire and release application resources with lifespan
Observe startup and cleanup by entering the TestClient context.
Module 10 · 1 lessons
Choose dependency cleanup scope for streaming
Distinguish request cleanup after the response from function cleanup before it.
Module 11 · 1 lessons
Bound concurrent asynchronous requests
Use await, an in-process ASGI transport and an explicit concurrency budget.
Module 12 · 1 lessons
Host validation and CORS solve different problems
Restrict accepted hosts and expose only an explicit browser-origin policy.
Module 13 · 1 lessons
Filter before limiting and count the same scope
Keep country, stable order, page size and observed totals consistent.
Module 14 · 1 lessons
BackgroundTasks is deferred process work, not a durable queue
Observe acceptance and execution without claiming crash-safe delivery.
Module 15 · 1 lessons
Check OpenAPI against behavior and clean up overrides
Use documentation as a contract artifact, not as proof that a branch executes.
Module 16 · 1 lessons
Capstone: an owner-scoped technical-role API
Combine identity, bounded filters, public fields and honest observed counts.