I'm working with a Python class and have come across private variables and methods. In my code, I've defined a class called 'Exam' with private attributes like __name, __roll, and __branch. When I create an instance of the class and try to access the __name attribute with obj._Exam__name, it works, but I'm curious about the underlying logic. Can anyone explain how private variables are accessed in Python? I'm aware that you can access them outside the class by prefixing with the class name, but I'm looking for a deeper understanding.
3 Answers
The philosophy behind Python is that private variables aren't necessary. The language provides a name-mangling feature, but its practicality can be debated. If you're aiming to signal that a variable should not be accessed directly, just use a single underscore. This is an accepted convention and communicates your intent clearly.
In Python, when you define a variable with a double underscore, it gets name-mangled, which is why you can access it with the syntax obj._Exam__name. This is essentially a way to avoid collisions in subclasses. However, it's generally recommended to use a single underscore for 'protected' variables instead of double underscores since that conveys intent without the need for name-mangling.
To access private or protected members, you can simply use a single underscore when you define them. For instance, if you have a method defined as _method, you can call it with obj._method. It’s a good practice to keep in mind how and when to use these access levels depending on your coding style.
Related Questions
How To: Running Codex CLI on Windows with Azure OpenAI
Set Wordpress Featured Image Using Javascript
How To Fix PHP Random Being The Same
Why no WebP Support with Wordpress
Replace Wordpress Cron With Linux Cron
Customize Yoast Canonical URL Programmatically