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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 self parameter for a method and got a TypeError, use TypeError: method () takes 1 positional argument but 2 were given instead If OP omitted self 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 . . .
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:
- Python self keyword - Stack Overflow
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, and in that article, Guido explains why use self and cls, and why they are necessary
- Why do I get TypeError: Missing 1 required positional argument: self?
See Why do I get 'takes exactly 1 argument (2 given)' when trying to call a method? for the opposite problem
- What does \\. self actually do in Swift SwiftUI? - Stack Overflow
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 so, then what does \ actually do when typing \ self and what does self actually do in combination with \?
- Difference between Python self and Java this - Stack Overflow
Moving further: Technically both self and this are used for the same thing They are used to access the variable associated with the current instance Only difference is, you have to include self explicitly as first parameter to an instance method in Python, whereas this is not the case with Java Moreover, the name self can be anything
- How to avoid explicit self in Python? - Stack Overflow
The "self" is the conventional placeholder of the current object instance of a class Its used when you want to refer to the object's property or field or method inside a class as if you're referring to "itself"
- Purpose of return self python - Stack Overflow
Returning self from a method simply means that your method returns a reference to the instance object on which it was called This can sometimes be seen in use with object oriented APIs that are designed as a fluent interface that encourages method cascading
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