I have a base class A in base.py: Then in new.py I created a new class B which inherits A and override test method: The problem is that the module1 is no longer available in new.py. Is there any options that I do not need to import module1 again in new.py? Answer One not recommended way to achieve what you
Tag: inheritance
How to print an instance of a parent class in base class?
I am able to print the name of Class Student when I inherit the class into Sports and define the values in the init method. but I am not able to figure out how to print the name given when Student class is created without defining the name in Sports class, When I comment out the Student.__init__(self, 1, R…
Init super with existing instance?
Suppose I have: How do I correctly initialize the super class with the output of the super class method rather than init? My OOP background is in C++ and I am continually getting into these scenarios due to the ability to overload constructors in C++, so a workaround for this would be awesome. Answer @shx2…
How can you test that a python typing Protocol is a subclass of another Protocol?
The obvious solution to the problem is to use issubclass, but this raises TypeError (using Python 3.6.7), e.g. Answer For more on the topic of python Protocols, see https://mypy.readthedocs.io/en/latest/protocols.html#using-isinstance-with-protocols In Python 3.6.7, one way to solve this is to use the @runtim…
What are “inheritable alternative constructors”?
I stumbled over the term “inheritable alternative constructors” in this answer: https://stackoverflow.com/a/1669524/633961 The link points to a place where classmethod gets explained. Do other programming languages have this feature, too? Answer One of the things that you can do with ANY language …
subclassing dict; dict.update returns incorrrect value – python bug?
I needed to make a class that extended dict and ran into an interesting problem illustrated by the dumb example in the image below. Why is d.update() ignoring the class’s __getitem__? EDIT: This is in python2.7 which does not appear to contain collections.UserDict Thinking UserDict.UserDict is the equiv…
Python circular imports with inheritance
I have a parent and child class, where a parent’s method returns an instance of the child. Both classes are in separate files classA.py and classB.py. In order to avoid circular imports when I import classA I added the classB import to the end of classA.py (as shown below). Everything worked well and I …
How to copy all attributes of one Python object to another?
I’ve got two classes, of which one inherits from the other: I now create a Parent and change the attributes: And from this point, I want to create a Child in which I want to copy all the attributes from the parent. I can of course do this like so: The thing is that while developing, this class will grow
How to create a subclass in python that is inherited from turtle Module
So, i’m trying to learn python and every time i post a question here it feels like giving in… I’m trying to make my own class of turtle.Turtle. Gives the Traceback: AttributeError: ‘TurtleGTX’ object has no attribute ‘_position’. Which I then learn is a “private…
Cast base class to derived class python (or more pythonic way of extending classes)
I need to extend the Networkx python package and add a few methods to the Graph class for my particular need The way I thought about doing this is simplying deriving a new class say NewGraph, and adding the required methods. However there are several other functions in networkx which create and return Graph o…