Self Help Group

Understanding self help group requires examining multiple perspectives and considerations. 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 just for methods but for Equally important, oop - What do __init__ and self do in Python?

Another key aspect involves, 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 self passing or as plain functions with explicit self passing. 2) Making classmethod s and staticmethod s means you want to be able to rename and omit self respectively. What is the purpose of the `self` parameter? For a language-agnostic consideration of the design decision, see What is the advantage of having this/self pointer mandatory explicit?.

This perspective suggests that, to close debugging questions where OP omitted a self parameter for a method and got a TypeError, use TypeError: method () takes 1 positional argument but 2 were given instead. in the body of the method and got a NameError, consider How can ... What difference does it make to use "self" to define a member in a ....

So, in the first method self specifies that Python should use the variable (attribute), that "belongs" to the class object we created, not a global one (outside the class). Python class methods: when is self not needed - Stack Overflow. In Python, every normal method is forced to accept a parameter commonly named self. This is an instance of class - an object.

This perspective suggests that, this is how Python methods interact with a class's state. It's important to note that, you are allowed to rename this parameter whatever you please. but it will always have the same value:

When to use self, &self, &mut self in methods? Say I want to implement a method that pretty prints the struct to stdout, should I take &self? From another angle, i guess self also works?

As you can see, this is exactly a case for &self. If you use self (or &mut self) the method will likely still compile, but it can only be used in more restricted situations. 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.firstname = firstname self. What does "\\.self" actually do in Swift/SwiftUI?

From another angle, i think it is setting the id for each list item as each item in the numbers array? Building on this, correct me if wrong - but is each id being set as whatever Int is in each entry of the numbers array? If so, then what does \ actually do when typing \.self and what does .self actually do in combination with \?