inheritance

Overriding django admin get_queryset() Question: I have two models which is one of them proxy model. In admin I registered both and overrided get_queryset() method but it is not working as expected. admin.py @admin.register(Category) class CategoryAdmin(admin.ModelAdmin): def get_queryset(self, request): qs = super().get_queryset(request) return qs.filter(language=’en’) @admin.register(ProxyCategory) class ProxyCategoryAdmin(CategoryAdmin): def get_queryset(self, request): qs = super().get_queryset(request) return qs.filter(language=’zh’) …

Why does a library class break when I try to store and use an instance (delegation) instead of making a subclass (inheritance)? Question: I’m making a game using the turtle standard library module for graphics. I have working code that creates a subclass of Turtle, like so: import random class Food(Turtle): def __init__(self): super().__init__() # …

Django CBV: How come my child method is not overriding my parent method? Question: I’m pretty new when it comes to python classes / django CBVs. I’m trying to have a method (print_test) from my child class override my parent class, but I can’t get it to work. What am I doing wrong? Below is …

Convert a python dict to correct python BaseModel pydantic class Question: My requirement is to convert python dictionary which can take multiple forms into appropriate pydantic BaseModel class instance. Following are details: class ConditionType(str, Enum): EXPRESSION = ‘EXPRESSION’ CYCLE_DUR_TREND = ‘CYCLE_DUR_TREND’ class ConditionalExpressionProps(BaseConditionalProps): conditional_expression: str class CycleDurationTrendProps(BaseConditionalProps): direction_up : bool = True n : int …

Python modify __getattribute__ Question: I want to modify the behaviour of _getattribute_ in "Parent class" (the reason is that a number of attributes are inside an XML element and for other reasons I don’t want to dump all the information from the XML element to the class as attributes). The approach I have tried is …

Default arguments in __init__ of class inheriting from int Question: I feel like I’m losing my mind. I was working on a simple project involving a subclass of int, which may not be the best idea, but I need to inherit many of int‘s magic methods for integer operations. I added a default argument wraps=True …

Inheriting more than 1 parent class in python Question: I am trying to inherit 2 classes as parent class in a child class both have different class variables class A has a,b while class B has c,d,e they are the parent to class AB(A,B) now i want to make an object of AB class but …

Automatically add decorator to all inherited methods Question: I want in class B to automatically add the decorator _preCheck to all methods that have been inherited from class A. In the example b.double(5) is correctly called with the wrapper. I want to avoid to manually re-declare (override) the inherited methods in B but instead, automatically …

Parent method is not called in Parent Class Question: class A: def __init__(self): self.j = 0 self.calc_i(865) def calc_i(self, i): self.i = 68 * i class B(A): def __init__(self): super().__init__() print("i from B is", self.i) def calc_i(self, i): self.i = 37 * i b = B() The Code above should call the parent class method …

How to annotate parent classmethod so that child methods return an instance of themselves? Question: I have a parent class BaseBlob that has several child classes LimitedProofId, ProofId, TxId. The parent class implement a deserialize class method that should return an instance of itself. I also have a Delegation class that takes a LimitedProofId. I …