Subclassing?

[alistairg]

I've been banging my head on this one - are there limits around subclass/superclass support?

I was expecting something like

class A:
  def __init__(self, something)
    log.debug("A Something")

class B(A):
  def __init__(self, something_else)
    super().__init__(self, something_else)

...to work, but it doesn't. Likely something obvious, but....

[dlashua]

inheritance (subclasses) work just fine, however, super() appears to not work.

[jrlacharnay]

Is there an alternative syntax? I've tried many but they all fail with different error messages:

• With super():

class A:
  def __init__(self, something):
    self.variable = something

class B(A):
  def __init__(self, something_else):
    super().__init__(something_else)

obj = B("test")
log.info(f"variable = {obj.variable}")

super().__init__(something_else)
^
RuntimeError: super(): __class__ cell not found

• By mentioning the parent class:

class A:
  def __init__(self, something):
    self.variable = something

class B(A):
  def __init__(self, something_else):
    A.__init__(self, something_else)

obj = B("test")
log.info(f"variable = {obj.variable}")

A.__init__(self, something_else)
^
TypeError: B.__init__() takes exactly one argument (the instance to initialize)

• Same thing but without the self parameter (it's not valid Python but I wanted to try)

class A:
  def __init__(self, something):
    self.variable = something

class B(A):
  def __init__(self, something_else):
    A.__init__(something_else)

obj = B("test")
log.info(f"variable = {obj.variable}")

log.info(f"variable = {obj.variable}")
^
AttributeError: 'B' object has no attribute 'variable'

• The Python 2 way:

class A(object):
  def __init__(self, something):
    self.variable = something

class B(A):
  def __init__(self, something_else):
    super(B, self).__init__(something_else)

obj = B("test")
log.info(f"variable = {obj.variable}")

super(B, self).__init__(something_else)
^
TypeError: B.__init__() takes exactly one argument (the instance to initialize)

[ALERTua]

my workaround on this is here: https://github.com/ALERTua/ha_pyscript_modules
basically it's

class Entity:
    def __init__(self, entity_id):
        self.entity_id = entity_id
        self.entity_init()

    def entity_init(self):
        pass  # a work to do


class Light(Entity):
    def __init__(self, entity_id):
        self.entity_id = entity_id
        self.entity_init()


class Window(Entity):
    def __init__(self, entity_id, reverse=False):
        self.entity_id = entity_id
        self.reverse = reverse
        self.entity_init()

    def some_move_func(self, position):
        if self.reverse:
            "this"
        else:
            "that"


class Switch(Entity):
    def __init__(self, entity_id):
        self.entity_id = entity_id
        self.entity_init()
        self.switch_init()

    def switch_init(self):
        """some work"""
        pass


class SubSwitch(Switch):
    def __init__(self, entity_id):
        self.entity_id = entity_id
        self.entity_init()
        self.switch_init()

[craigbarratt]

Thanks for posting a workaround. Since pyscript is implemented as a python interpreter, it misses some more advanced features, like aspects of subclassing. I'm open to any PRs to improve its implementation of classes and any other areas where it deviates from real python.