Trying to make a decorator to make triggers lazily

trigger_decorator.py

from kivy.event import EventDispatcher
from kivy.clock import Clock
from functools import partial


class trigger(object):
    """Make a trigger from a method outside of your class's __init__."""
    def __init__(self, func_or_timeout):
        if callable(func_or_timeout):
            self.func = func_or_timeout
            self.timeout = 0
        else:
            self.func = None
            self.timeout = func_or_timeout

    def __call__(self, func):
        self.func = func
        return self

    def __get__(self, instance, owner=None):
        if instance is None:
            # EventDispatcher iterates over its attributes before it instantiates.
            # Don't try making any trigger in that case.
            return
        retval = Clock.create_trigger(
            partial(self.func, instance), self.timeout
        )
        setattr(instance, self.func.__name__, retval)
        return retval


class Salad(EventDispatcher):
    def toss(self, *args):
        pass
    _trigger_toss = trigger(toss)
    
    @trigger(2)
    def _trigger_after_2_secs(self, *args):
        pass
    
    @trigger
    def _trigger_serve(self, *args):
        # for when a method should only be usable via trigger
        pass