derived-class Archives

How to force/ensure class attributes are a specific type?

January 7, 2021 James Cameron

Question or problem about Python programming: How do I restrict a class member variable to be a specific type in Python?

overriding bool() for custom class

January 6, 2021 Oceane Wilson

Question or problem about Python programming: All I want is for bool(myInstance) to return False (and for myInstance to evaluate to False when in a conditional like if/or/and. I know how to override >, >> bool(MinPriorityQueue([]) False >>> bool(MinPriorityQueue([1,3,2]) True Solution 4: test.__nonzero__() Solution 5: Similar to John La Rooy, I use: class Test(object): def […]

Is there a way to circumvent Python list.append() becoming progressively slower in a loop as the list grows?

January 5, 2021 James Cameron

Question or problem about Python programming: I have a big file I’m reading from, and convert every few lines to an instance of an Object.

Functions Defined The core of extensible programming is defining functions. Python allows mandatory and optional arguments, keyword arguments, and even arbitrary argument lists.

Are multiple classes in a single file recommended?

January 4, 2021 Odhran Miss

Question or problem about Python programming: Coming from a C++ background I’ve grown accustomed to organizing my classes such that, for the most part, there’s a 1:1 ratio between classes and files. By making it so that a single file contains a single class I find the code more navigable. As I introduce myself to […]

Python super method and calling alternatives

January 2, 2021 Abreonia Ng

Question or problem about Python programming: I see everywhere examples that super-class methods should be called by:

Python is a powerful general-purpose programming language.

new and init in Python

January 1, 2021 Odhran Miss

Question or problem about Python programming: I am learning Python and so far I can tell the things below about __new__ and __init__:

assigning class variable as default value to class method argument

January 1, 2021 Oceane Wilson

Question or problem about Python programming: I would like to build a method inside a class with default values arguments taken from this class. In general I do filtering on some data. Inside my class I have a method where normally I pass vector of data. Sometimes I don’t have the vector and I take […]

Define a method outside of class definition?

January 1, 2021 Ogima Cooper

Question or problem about Python programming: class MyClass: def myFunc(self): pass Can I create MyFunc() outside of the class definition, maybe even in another module? How to solve the problem: Solution 1: Yes. You can define a function outside of a class and then use it in the class body as a method: def func(self): […]

Importing modules inside python class

December 31, 2020 Simon Abital

Question or problem about Python programming: I’m currently writing a class that needs os, stat and some others.

How to cast a struct to Anyobject in Swift 2?

December 30, 2020 Jeffrey Schneider

Question or problem in the Swift programming language: I have,