01 · Render a catalog
Route requests and render semantic HTML with escaped search values and workshop detail pages.
Continue from Parts I–III
Python Foundations Workshop IV
Build Workshop Desk, a browser app with a searchable catalog, sign-in, reservations, and accessible forms.
1,000pages
96runnable cases
12chapters
3connected projects
12 chapters
Find a topic
12 chapters
01 Route a browser request
Route requests by method and path. Decode dynamic IDs and keep URL construction separate from HTML interpolation.
Pages 5–77 · 8 cases02 Render HTML with explicit context
Render HTML with context-aware encoding. Preserve user text without giving it markup or navigation authority.
Pages 78–150 · 8 cases03 Forms and server-side validation
Accept browser form data through a bounded parser. Validate values and relationship rules before a write.
Pages 151–223 · 8 cases04 Accessible forms and views
Use semantic markup, meaningful action labels, errors associated with inputs, and status announcements.
Pages 224–296 · 8 cases05 Browser write flows and persistence
Commit state changes as one transaction. Use unique constraints, check capacity, and redirect after a successful POST.
Pages 337–409 · 8 cases06 Session cookies and expiry
Map a cookie to server-side state. Enforce expiry, rotate at sign-in, and invalidate at sign-out.
Pages 410–482 · 8 cases07 CSRF and browser write protection
Check form tokens before browser writes. Use the current session and apply a deliberate origin policy.
Pages 483–555 · 8 cases08 Sign-in and resource ownership
Verify the actor separately from the requested resource. Scope every private query and mutation to that actor.
Pages 556–628 · 8 cases09 Search, filters and pagination
Design search and pagination as part of the browser interface. Keep current filters and stable sort order in navigation.
Pages 669–741 · 8 cases10 Response policies and error pages
Choose status, headers and user feedback that reflect the real outcome. Keep private documents out of shared caches.
Pages 742–814 · 8 cases11 Progressive enhancement and browser UX
Keep a usable native browser path. Add JavaScript enhancements only when their failure leaves the original flow usable.
Pages 815–887 · 8 cases12 Browser integration and release rehearsal
Test realistic sequences and refused actions. Inspect the stored result and verify keyboard behavior separately from HTTP status.
Pages 888–960 · 8 cases
Three connected projects
Build Workshop Desk
02 · Sign in and reserve
Rotate sessions, validate form tokens, reserve a seat in a transaction, and enforce ownership.
03 · Rehearse an accessible release
Check labels, keyboard navigation, denied writes, logout, and a real local HTTP response.
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The series
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The PDF and ZIP include 96 runnable cases with assertions and recorded output, a project suite with tests, and a curriculum index. Use Python 3.12 or newer.
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