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Questions tagged [abc]

Abstract Base Classes are non-instantiable classes used to define the expected behaviour of subclasses.

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10 sites through same codebase django MTI, ABCs or EAV

I have a django based web shop that has been evolving over the past year. Currently there's about 8 country specific shops running through the same code base, plus an API, and there's soon to be a B2B website, and a few more countries to add to the…
user307927
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how to inherit and enforce an abstract method defined in a superclass with __metaclass__ = ABCMeta

There is class A (in another package) that defines an abstract method my_abstract_method() using the old way of defining an abstract class by setting __metaclass__ = ABCMeta. My class B is a subclass of A, and I would like B to inherit A's…
morfys
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Abstract class, repeated inheritance, specific example

I am working on a codebase that I don't entirely master (yet). I have the following 3-class stucture: class Processor(ABC): @abstractmethod def process(self, *args: Any, **kwargs: Any): pass class AbstractEsTask(Processor, ABC): …
hartmut
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How to define two identical classes with different method parameter names?

I'm developing a scientific library where I would define vector functions in the time and frequency domain (linked by FFT). I created a class for vector formulas in the freq domain, and now I'd want to define an identical class for the time…
Neinstein
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Manipulating function docstring and signature in base class

I have an abstract base class Base that provides an abstract method _run() that needs to be implemented by derived classes, as well as a method run() that will call _run() and do some extra work that is common to all derived classes. In all derived…
jhansen
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Understanding Abstract Base Classes in Python

I was reading about abstract base class and came across https://www.python-course.eu/python3_abstract_classes.php website. I got general idea about them but I found two statement contradictory of each other. Subclasses of an abstract class in…
Pratik
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Verifying that an object instance complies with ABC in Python

I have an API that receives a serialized representation of an object that I expect to comply with a particular interface (known at development time). The serialized data I receive includes details that are used to create implementations of the…
SlyCaptainFlint
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Python : Using abc in Python < 2.6

Do someone know an implementation of abc for older versions of Python (older than 2.6) ? EDIT : I am for example looking for a snippet that would do the same thing as ABCMeta and abstractmethod, with same interface, I actually need to make a piece…
sebpiq
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How do I create a class level property in an abstract base class (Python 3+) that I want derived classes to define?

Is there a standard way for creating class level variables in an abstract base class (ABC) that we want derived classes to define? I could implement this with properties as follows: from abc import ABC from abc import abstractmethod class…
Gaurav Keswani
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Python abstract method inside implemented base class method

I'm able to authenticate against some RESTful API with one of the following methods: password certificate anonymous I've created AuthenticationBase class and its…
user3719188
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Making a class abstract the old way wont work

I am trying to create an abstract base class. When using the syntax of python 3, it work perfectly. But then when I switch to the syntax of python 2.7 it just wont work. the following code is written in 2.7 syntax, and if I run it, it will work,…
Max
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Python checking type of list elements

I'm trying use ABC and... Checking type of single parameter is quite straithforward: def spam_method(param): if not isinstance(param, SpamInterface): raise TypeError It looks good. In first line of method definition is mentioned what type I…
Maciej Wawrzyńczuk
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Python 3 ignores metaclass directive?

Edited I have 2 classes inheriting from ABC, and a third class inheriting from both, each in a different file. Tried to provide the metaclass of ABCMeta to the last class, to resolve the conflict of metaclasses, but it fails with the same…
Vitaliy
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Need suggestions for fixing ABC error?

I'm creating a boid flocking simulator and getting some errors. Suspecting they are issued by wrong usage of ABC. But I can't fix the error, been trying for a day. the primary issue is in the Check_input class. flyers is somehow undefined and I'm…
Arcane
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Why does this mypy, slots, and abstract class hack work?

I've got a relatively big Python project and in an effort to minimise debugging time I'm trying to emulate a few aspects of a lower-level language. Specifically Ability to type cast (Static Typing) Prevent dynamic attribute addition to classes.…
m4p85r
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