I have a Python (3.8) metaclass for a singleton as seen here I've tried to add typings like so: from typing import Dict, Any, TypeVar, Type _T = Ty ...
I have a Python (3.8) metaclass for a singleton as seen here I've tried to add typings like so: from typing import Dict, Any, TypeVar, Type _T = Ty ...
I want to implement singleton with a python metaclass. I create two threads, instantiate the "File" class and verify that the hashcode of both is the ...
I want to do a generic class in Python with one method This class does not generate its instances Some attributes are set in the body of the cla ...
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 s ...
All classes are subclasses of the object and at the same time they all are instances of the type. Therefore, the object is an instance of the type, an ...
I would like to prevent a user of an instance mistakenly creating a non existing attribute when using said object. Say I have a class with an init an ...
How can one extend __class_getitem__ for a Python Generic class? I want to add arguments to __class_getitem__ while having some be propagated upwards ...
I am trying to write my own implementation of test runner, what I struggle with is some kind of setUp and TearDown methods and how to override/invoke ...
In Python, it's no secret that you can implement attributes of an instance of a class dynamically. Here's what that looks like: Result: Is there ...
Background We have a special setup for which I want to write a TestCase base class / mixin that can be used to provide functionality out-of-the-box f ...
So I have super(MyMeta, cls).__new__(cls, name, bases, attr) to call the default __new__ function? Can I do similar for __init__? To call the default ...
I tend to write a lot of functions which convert input arguments into instances of a user-defined class. class Klaus: def __init__(*args): ...
I want to wrap a function name funky_the_function with an object which has a __call__ method defined. Without using functools.wraps the name of the w ...
When using dataclasses.dataclass the type information informs how parameters are parsed. I would like to take a defined dataclass and produce a class ...
I have read answers for this question: What are metaclasses in Python? and this question: In Python, when should I use a meta class? and skimmed throu ...
I'm wondering if there's a way of seeing whether a class is inherited from another class based on the type object for a given object. Say I have the ...
This is my code snippet of trying to create a custom exception class which takes a input parameter about the exception and I am planning to use it ...
Origin of question I have recently working with django and became usedto of Meta class in models, Serializers and Forms. My Understanding so far I c ...
I have used the following Mixin class to inherit decorators along sub-classes. The Problem is that when a method has more than one decorator than they ...
I trying to define a Python metaclass to limit the number of attributes that a class may contain, starting at creation time. I am constrained to use P ...