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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.
How to type annotate a method that returns self?
This is also relevant for special methods, for example __enter__ traditionally returns self, so it would be nice to have a way to specify this without needing to even mention it in
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
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
sql
A self join is a join of a table with itself. A common use case is when the table stores entities (records) which have a hierarchical relationship between them.
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
Why do I get "TypeError: Missing 1 required positional argument:
See Why do I get ''takes exactly 1 argument (2 given)'' when trying to call a method? for the opposite problem.
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
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
What''s the difference between self and Self?
Self is the type of the current object. It may appear either in a trait or an impl, but appears most often in trait where it is a stand-in for whatever type will end up implementing the
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