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django-gandalf

django-gandalf lets you declare multi-step, tree-shaped Django form flows as readable, composable code.

You build a flow with a small, immutable builder — .step() to add a form, .branch() to fork on an answer, .expand() to grow steps from an answer — and mount it as an ordinary Django view. Gandalf handles the per-step URLs, the session state, back-navigation, editing, file uploads, and running your completion logic exactly once. When one wizard is not enough, it handles the task list of wizards too: sections the user does in any order, lists they grow, sections that unlock or appear because of what they said elsewhere, and a submit at the end of all of it.

from gandalf.wizard import Wizard, condition

application = (
    Wizard()
    .step(ApplyingAsForm, name="applying-as")
    .branch(
        condition(is_organisation, Wizard().step(OrganisationForm, name="organisation")),
        default=Wizard().step(AboutYouForm, name="about-you"),
    )
    .step(EmailForm, name="contact")
)

The only dependency is Django. Requires Python 3.10+ and Django 4.2+.

Installation

pip install django-gandalf   # or: uv add django-gandalf

Gandalf ships no models or migrations, but it relies on standard Django plumbing — the sessions app and middleware, and the request context processor. Configuration has the exact settings.

Documentation

The docs are in two halves, and you can start at either.

Learn is a walkthrough: one community grant application, built up a chapter at a time. Each chapter adds one idea, says why it exists, and leaves a runnable application behind. It deliberately does not cover every hook and every edge — read it start to finish the first time.

Reference is one page per thing — Wizard, WizardViewSet, the summary, task lists, add another, storage, the driver, the testing helpers — each with the complete API, worked usage, and troubleshooting. Come here when you know what you are looking for.

I want to… Go to
build my first wizard Learn, chapter 1
see every builder method Reference: Wizard
override a viewset hook Reference: WizardViewSet
build a task list of wizards Learn, chapter 12 · Reference: Task lists
test a wizard Reference: Testing
migrate from django-formtools Coming from formtools
know what replaying costs Reference: Walk costs
drive a wizard from a script or an agent Reference: Driver

Every Learn chapter is real code under tests/testapp/readme/, driven end to end by tests/functional/test_readme_examples.py. just serve runs them at http://127.0.0.1:8000/ so you can click through.

Contributing

See CONTRIBUTING.md for local setup, the separated unit and functional test commands, and commit conventions. ARCHITECTURE.md is the runtime-level view of how the pieces fit; AGENT_ACCESS.md is the design behind the driver and the agent.

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