Why does defining new class sometimes call the __init__() function of objects that the class inherits from? Question: I’m trying to understand what actually happens when you declare a new class which inherits from a parent class in python. Here’s a very simple code snippet: # inheritance.py class Foo(): def __init__(self, *args, **kwargs): print("Inside foo.__init__") …
how a toplevel class can inherite from the main class tkinter opp inorder to access main class's attr Question: I want to access the main window attributes and change some of its labels and button’s states in my toplevel class however it can not find them. So I’m not sure how to use opp approach …
using class inheritance on tkinter python Question: please help, I am trying to create a button on a tkinter window with the use of python class inheritance but it does not show the button. I am new to inheritance in python and not sure how do this. please see my code. thanks in advance from …
Python – Inherited methods break when overriding __init__ Question: I have a geometric base class ExtrudedSurface and a child class Cylinder, which is a ‘kind of’ extruded surface. The base class has a method to translate itself (not in-place) by constructing a modified version of itself. I would like to re-use this method by the …
Values grabbed through one class are not being passed to the inheriting class in PyQT5 Question: I am building a GUI for a hand tracking app using PyQT5. There are two windows: one ‘MainWindow’ which displays the camera view, and one called ‘Window 2’ which holds multiple checkboxes that correspond to actions that can be …
How to declare instance variables in abstract class? Question: class ILinkedListElem: @property def value(self): raise NotImplementedError @property def next(self): raise NotImplementedError class ListElem(ILinkedListElem): def __init__(self, value, next_node=None): self.value = value self.next = next_node I wanna something like this. This abstract variables definition works for class vars, but not for instance I want to all instances …
Difficulty instantiating a subclass [object has no attribute] Question: I get two types of errors when I try to start or initiate the member function temp_controll from the subclass Temperature_Controll. The issue is that the while loops are started in a new thread. I am having trouble passing the modbus client connection to the member …
C-like forward declaration in python class Question: How would I properly do the following in python? class AnyType: def __init__(self, Type:Union[PrimitiveType, ComplexType]): self.Type = Type class PrimitiveType(AnyType): def __init__(self, Type): super().__init__(Type) class NestedType(AnyType): def __init__(self, Type): super().__init__(Type) NameError: name ‘PrimitiveType’ is not defined I know in C there is a forward declaration but how do …
How does inheritance of class variables work in Python? Question: I’m trying to get back to Python but I don’t get why the following code doesn’t work as intended. class Cat: age = 0 class Dog(Cat): pass Dog.age = 1 Cat.age = 2 print(Dog.age, Cat.age) My output is: 1 2 But why doesn’t Dog.age equals …
How do I return class type instead of built-in type when inheriting from built-in class – Python Question: class StringMethods(str): """ StringMethods class: A class inheriting from the built in python ‘str’ class, but with extended methods for string analysis, password checking etc. """ def contains(self, char: str) -> bool: """ True if self contains …
