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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
- sql - Explanation of self-joins - Stack Overflow
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 SELF JOIN and when would you use it? [duplicate]
A self join is simply when you join a table with itself There is no SELF JOIN keyword, you just write an ordinary join where both tables involved in the join are the same table One thing to notice is that when you are self joining it is necessary to use an alias for the table otherwise the table name would be ambiguous It is useful when you want to correlate pairs of rows from the same
- Python class methods: when is self not needed - Stack Overflow
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 interact with a class's state You are allowed to rename this parameter whatever you please but it will always have the same value:
- 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
- ios - What is self used for in Swift? - Stack Overflow
I am new to Swift and I'm wondering what self is used for and why I have seen it in classes and structures but I really don't find them essential nor necessary to even mention them in my code Wh
- 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
- Difference between this and self in JavaScript - Stack Overflow
Everyone is aware of this in javascript, but there are also instances of self encountered in the wild, such as here So, what is the difference between this and self in JavaScript?
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