flow.switch().case() Django-Viewflow中的非布尔比较

from viewflow import flow
from viewflow.base import this, Flow
from viewflow.flow.views import CreateProcessView, UpdateProcessView

class MyFlow(Flow):
    process_class = MyProcess

    start = (
        flow.Start(CreateProcessView, fields=["status"])
        .Permission(...)
        .Next(this.check_status)
    )

    check_status = (
        flow.View(
            UpdateProcessView,
            fields=["status"],
            task_description="Check Status"
        )
        .Permission(...)
        .Next(this.handle_status)
    )

    handle_status = (
        flow.switch(this.check_status.process.status)
        .case('A', this.do_something)
        .case('B', this.do_another_thing)
        .case('C', this.do_something_else)
    )

    do_something = (
        flow.Handler(...).Next(this.end)
    )

    do_another_thing = (
        flow.Handler(...).Next(this.end)
    )

    do_something_else = (
        flow.Handler(...).Next(this.end)
    )

    end = flow.End()