I have started to write a series of apps with Appdaemon to control my electrical consumption smarter. I now have created 5 apps which today includes copy of the same code in the apps. I had an idea to create class that inherits from hass.Hass where I put all the common functionality. Then each app inherits from that. I came to a situation where I wanted to define abstract methods which my apps needed to implement. All with the purpose to make the apps similar and simple to develop.
After some googling I found https://www.geeksforgeeks.org/abstract-classes-in-python/ which described the class ABC which introduces abstract methods.
Before I even try to create the abstract methods I run into problem with the setup.
I defined the class like this:
import appdaemon.plugins.hass.hassapi as hass
from datetime import datetime, timedelta, date
from abc import ABC, abstractmethod
class NLEnergyBase(hass.Hass, ABC):
...
The I have a app that used the class like this:
from datetime import datetime, timedelta
from NLEnergyBase import NLEnergyBase
class CarChargerV3(NLEnergyBase):
...
When I run this app this is what is written into the error log:
2023-01-15 21:25:35.630008 WARNING BilladdareV3: ------------------------------------------------------------
2023-01-15 21:25:35.630543 WARNING BilladdareV3: Unexpected error initializing app: BilladdareV3:
2023-01-15 21:25:35.630917 WARNING BilladdareV3: ------------------------------------------------------------
2023-01-15 21:25:35.632048 WARNING BilladdareV3: Traceback (most recent call last):
File "/usr/lib/python3.10/site-packages/appdaemon/app_management.py", line 1026, in check_app_updates
await self.init_object(app)
File "/usr/lib/python3.10/site-packages/appdaemon/app_management.py", line 321, in init_object
modname = await utils.run_in_executor(self, __import__, app_args["module"])
File "/usr/lib/python3.10/site-packages/appdaemon/utils.py", line 337, in run_in_executor
response = future.result()
File "/usr/lib/python3.10/concurrent/futures/thread.py", line 58, in run
result = self.fn(*self.args, **self.kwargs)
File "/config/appdaemon/apps/energy/CarChargerV3.py", line 16, in <module>
class CarChargerV3(NLEnergyBase):
File "/usr/lib/python3.10/abc.py", line 106, in __new__
cls = super().__new__(mcls, name, bases, namespace, **kwargs)
TypeError: NLEnergyBase.__init_subclass__() missing 1 required positional argument: 'a'
2023-01-15 21:25:35.632564 WARNING BilladdareV3: ------------------------------------------------------------
I have not defined a __init__ method for my class.
Is it impossible to use abstract methods using the class ABC in Appdaemon?
Is it obvious what I’m doing wrong?