Difference between ‘cls’ and ‘self’ in Python classes?
Why is cls sometimes used instead of self as an argument in Python classes? For example:
self
TypeError: method() takes 1 positional argument but 2 were given
In Python, this: …is syntactic sugar, which the interpreter translates behind the scenes into: …which, as you can see, does indeed have two arguments – it’s just that the first one is implicit, from the point of view of the caller. This is because most methods do some work with the object they’re called on, so … Read more
What __init__ and self do in Python?
In this code: … the self variable represents the instance of the object itself. Most object-oriented languages pass this as a hidden parameter to the methods defined on an object; Python does not. You have to declare it explicitly. When you create an instance of the A class and call its methods, it will be passed automatically, as in … Read more
What is the purpose of the word ‘self’?
The reason you need to use self. is because Python does not use the @ syntax to refer to instance attributes. Python decided to do methods in a way that makes the instance to which the method belongs be passed automatically, but not received automatically: the first parameter of methods is the instance the method is called on. That makes methods entirely the … Read more