Subclassing Python Classes not working for some reason

[Flower lady]

Hi folks,

I'm getting a strange bug. I initialize a base class:

"""
Script for the BaseBehavior class
"""
from PythonQt.scriptedBehaviors import PythonBehavior

# ==============================================================================
# Globals
# ==============================================================================
DEBUG_MODE = True

# ==============================================================================
# Classes
# ==============================================================================

class BaseBehavior():
    """ Base behavior from which all scripted behaviors must inherit
    """
    def __init__(self):
        """Create the behavior, and underlying C++ PythonBehavior object"""
        self._behavior = PythonBehavior()
        self.log_info("CONSTRUCTED PYTHON BEHAVIOR")
        return

    def initialize(self):
        """Initialize"""
        self.log_info("INITIALIZED BEHAVIOR")
        return 1

    def update(self, delta_ms: int):
        self.log_info("UPDATING BEHAVIOR")
        return 1

    def fixed_update(self, delta_ms: int):
        self.log_info("FIXED UPDATE FOR BEHAVIOR")
        return 1

    def log_info(self, info: str=""):
        """ Log given string as info """
        if DEBUG_MODE:
            self._behavior.log_info(info)
            return 1
        return 0

    def log_warning(self, info: str=""):
        """ Log given string as info """
        self._behavior.log_warning(info)
        return 1

Using:

PythonQt::self()->getMainModule().evalScript(code);

My base class logs messages to std::out, and this works just fine when I instantiate the base class:

test_base = BaseBehavior()

However, I tried subclassing BaseBehavior as such:

"""
Script for the TestBehavior class
"""
from base_behavior import BaseBehavior 
# from PythonQt.components import Transform
# ==============================================================================
# Globals
# ==============================================================================

# ==============================================================================
# Classes
# ==============================================================================
class TestBehavior(BaseBehavior):
    """ Test behavior from which all scripted behaviors must inherit
    """
    def __init__(self):
        """Create the behavior, and underlying C++ PythonBehavior object"""
        # BaseBehavior.__init__(self)
        super().__init__()
        return

    def initialize(self):
        """Initialize"""
        return True

    def update(self, delta_ms: int):
        return super().update(delta_ms)

    def fixed_update(self, delta_ms: int):
        return True

And then instantiated the subclass:

test_subclass = TestBehavior()

But no messages get logged. Very strange.. They DO get logged when I replace my update method with:

    def update(self, delta_ms: int):
        self._behavior.log_info("UPDATING BEHAVIOR")

This means that the parent class constructor is getting called properly, but that for some reason, the parent class's update routine isn't getting called correctly. Additionally, when I try to call log_info from the parent class as below, I get the same failure to log messages.

    def update(self, delta_ms: int):
        return super().log_info("UPDATING BEHAVIOR")

Any ideas? If it helps, when I try to use PythonQt's "call" on the update routine to return "super().update(delta_ms)", I get an invalid QVariant returned, instead of the actual output.

[Florian Link]

Google for super and its problems. Then do direct calls to your base class using BaseClass.xzy(self, arg1, ...). Btw, this has nothing to do with PythonQt itself, it is a pure Python problem.

[Flower lady]

Okay, I just thought this might be PythonQt-specific, since it runs fine when I run these scripts directly with the same python distribution. Calling the base class directly, as below, also doesn't seem to help me:

def update(self, delta_ms: int):
"""Update routine for TestBehavior"""
        return BaseBehavior.update(self, delta_ms)

[Flower lady]

Resolved this, the problem was some incorrect import syntax as I was pulling everything into the main module scope.