Inheritance with App classes in Appdaemon

Third party integrations AppDaemon
1

I’ve just started to organize my automations through appdaemon, so I’m still learning. My initial plan was to simplify repeated scenarios, like power saving lights (turns off after x min) and motions detection.

I’ve created a PowersavingLight class that works well. It just uses a countdown timer to turn the lights off when the timer reaches 0. The timer is controlled by input_number entities in the UI and a cleaning mode switch that disables the timer. I was hoping to build off that functionality for certain lights that should respond to motion. The idea was to create a new class, MotionLight, that inherits the PowersavingLight class but I seem to be running into an error.

FYI, my python is quite rusty, but I thought the inheritance process works as follows.

import hassapi as hass
import globals
import os
import datetime

class PowersavingLight(hass.Hass):

    DEFAULT_TIMER_DURATION_M  = 30 # MIN
    TIMER_PERIOD_S            = 5  # SECONDS
    SEC_PER_MIN               = 60

    def initialize(self):

        self.description = "EMPTY"
        self.duration = self.DEFAULT_TIMER_DURATION_M
        self.duration_id = None
        self.timer_handle = None
        self.time_remaining = None
        self.light = None
        self.cleaning_mode = "off"

etc....

import hassapi as hass
import globals
import powersaving_lights

#
# Motion activate lights.  Extends Power Saving lights
#

class MotionLight(PowersavingLight):

    def initialize(self):
        if "motion_sensor" in self.args:
            self.motion_sensor = self.args["motion_sensor"]

Here’s the error

2020-11-10 09:34:12.683826 INFO AppDaemon: Reloading Module: /conf/apps/motion_lights.py
2020-11-10 09:34:12.683920 INFO AppDaemon: Loading App Module: motion_lights
2020-11-10 09:34:12.685086 INFO AppDaemon: Initializing app motion_lights using class MotionLight from module motion_lights
2020-11-10 09:34:12.686218 WARNING motion_lights: ------------------------------------------------------------
2020-11-10 09:34:12.686494 WARNING motion_lights: Unexpected error initializing app: motion_lights:
2020-11-10 09:34:12.686730 WARNING motion_lights: ------------------------------------------------------------
2020-11-10 09:34:12.687046 WARNING motion_lights: Traceback (most recent call last):
  File "/usr/local/lib/python3.8/site-packages/appdaemon/app_management.py", line 907, in check_app_updates
    await self.init_object(app)
  File "/usr/local/lib/python3.8/site-packages/appdaemon/app_management.py", line 294, in init_object
    "object": app_class(
TypeError: MotionLight() takes no arguments

What am I missing?

2

Hi @amclean1980,

You need to import the class PowersavingLight like:

from powersaving_lights import PowersavingLight

Also, you probably want to call the initialize from the parent class, ao in the MotionLight in the initialize function, you will need to do:

super().initialize()

Let me know if this works, I am happy to help further if needed :slight_smile:

Regards,
Xavi M.

3

ha, thanks. I was just reading about imports and realized my error. I was just about to delete the post because it’s pretty basic Python that I forgot.

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