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Python class methods: when is self not needed

17 What is self? In Python, every normal method is forced to accept a parameter commonly named self. This is an instance of class - an object. This is how Python methods

2024 May 28

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What difference does it make to use "self" to define a member in a

A.x is a class variable. B ''s self.x is an instance variable. i.e. A ''s x is shared between instances. It would be easier to demonstrate the difference with something that can be modified like a list:

2025 Dec 13

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When do you use ''self'' in Python?

Are you supposed to use self when referencing a member function in Python (within the same module)? More generally, I was wondering when it is required to use self, not

2025 Jun 14

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Difference between ''cls'' and ''self'' in Python classes?

Why is cls sometimes used instead of self as an argument in Python classes? For example: class Person: def __init__(self, firstname, lastname): self rstname = firstname self.

2025 Jun 07

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When to use self, &self, &mut self in methods?

Self is an alias for the type that the impl block is for. The rules of ownership and borrowing apply to self as they apply to any other parameter (see e.g. this answer). Examples

2025 Oct 21

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oop

In this case, there are some benefits to allowing this: 1) Methods are just functions that happen defined in a class, and need to be callable either as bound methods with implicit

2025 Dec 02

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Python ''self'' keyword

9 First, Python''s self is not a keyword, it''s a coding convention, the same as Python''s cls. Guido has written a really detailed and valuable article about the origin of Python''s support for class,

2024 Feb 04

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What does ".self" actually do in Swift/SwiftUI?

I think it is setting the id for each list item as each item in the numbers array? Correct me if wrong - but is each id being set as whatever Int is in each entry of the numbers array? If

2025 Sep 25

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ios

When self is accessed in a type method (static func or class func), it refers to the actual type (rather than an instance). When self is used this way, it actually returns what in

2025 Oct 06

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What is the purpose of the `self` parameter? Why is it needed?

For a language-agnostic consideration of the design decision, see What is the advantage of having this/self pointer mandatory explicit?. To close debugging questions where OP omitted a

2025 Sep 19

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