An implementation of the singleton pattern must:
- ensure that only one instance of the singleton class ever exists;
- and provide global access to that instance.
Typically, this is done by:
- declaring all constructors of the class to be private;
- and providing a static method that returns a reference to the instance.
The instance is usually stored as a private static variable; the instance is created when the variable is initialized, at some point before the static method is first called. The following is a sample implementation written in Java.
OOP in Kotlin
Implementing Equality and Hash Methods in Python
Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
Elegant ways to support equivalence (“equality”) in Python classes
Add Method to a Python Class
Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
https://www.ianlewis.org/en/dynamically-adding-method-classes-or-class-instanc
http://block.arch.ethz.ch/blog/2016/07/adding-methods-to-python-classes/