04: Ignore and Reentry

Source: examples/04_ignore_reentry.py

This example contrasts ignored triggers with reentry transitions, and shows their effect on entry/exit actions.

Run

uv run python examples/04_ignore_reentry.py

What This Example Covers

• Ignoring triggers in a state with ignore(...)
• Re-firing in the same state with permit_reentry(...)
• Logging entry and exit behavior to validate semantics
• Error behavior when a trigger is not configured

Key APIs Used

sm.configure(State.A).on_entry(on_entry("A")).on_exit(on_exit("A")).permit(
    Trigger.STEP, State.B
).ignore(Trigger.IGNORE_ME).permit_reentry(Trigger.REENTER)

Notes

• ignore(...) keeps state unchanged and runs no transition actions.
• permit_reentry(...) exits and re-enters the same state, so exit/entry handlers run.