Linked Questions

Is there a way to trigger code when my class is subclassed? class SuperClass: def triggered_routine(subclass): print("was subclassed by " + subclass.__name__) ...

I have some confusion regarding meta-classes. With inheritance class AttributeInitType(object): def __init__(self,**kwargs): for name, value in kwargs.items(): setattr(self, ...

This might be too much of an open ended question, but I'm just now learning about metaclasses in Python and I don't understand how a metaclass is any different than just having a child class inherit ...

I came upon this reading the python documentation on the super keyword: If the second argument is omitted, the super object returned is unbound. If the second argument is an object, isinstance(obj, ...

I have a rough idea of what meta-classes are. They are the classes of which class objects are based on (because classes are objects in Python). But could someone explain (with code) how one goes about ...

I know we can overload behavior of instances of a class, e.g. - class Sample(object): pass s = Sample() print s <__main__.Sample object at 0x026277D0> print Sample <class '__main__.Sample'&...

I don't know what does super().__init__(*args, **kwargs) do here. class B(type): def __init__(self, *args, **kwargs): self.a = 'a' super().__init__(*args, **kwargs) class A(...

I read two articles about Metaclassing in python: What is a metaclass in Python? http://jakevdp.github.io/blog/2012/12/01/a-primer-on-python-metaclasses/ And I read about the ABC(abstract base ...

Use of isinstance() changed the class type of dict Why is this happening? I know using builtins would prevent but I want to understand better why this is happening. 250 def printPretty(records,...

Open a python shell on your django project root with python manage.py shell and observe the following: >>> class A(object): pass #checking type of user-defined class ... >>> type(A) ...

I have the following Python code: class Singleton(type): _instances = {} def __call__(cls, *args, **kwargs): if cls not in cls._instances: cls._instances[cls] = super(...

Based on my limited Python knowledge Metaclass is another class. In the following example I am just building a metaclass. Here I overloaded the __new__ method. My expectation is at the end of the ...

Instances are objects created from classes. Classes are objects too, but created from metaclasses. Functions are objects, methods are objects, files are objects, everything in Python is an object. ...

I am trying to use https://github.com/iandees/mongosm/blob/master/insert_osm_data.py this package. It seems like it is written in Python2. I have converted all the way to next(context). However, I am ...

When browsing the source code for the django_filters library, I found a class declaration syntax that I've never seen before: inheritance with arguments. I could not find an explanation in the ...