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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
python - Pra que serve o self ? - Stack Overflow em Português Estou estudando Python para complementar meus programas em Nodejs Porém por que em Python, uma linguagem que preza a velocidade no desenvolvimento e facilidade no código, é utilizado o self? Ex
oop - Why do you need explicitly have the self argument in a Python . . . By making the self reference explicit, you're free to refer to any object by that self reference Also, such a way of playing with classes at runtime is harder to do in the more static languages - not that's it's necessarily good or bad It's just that the explicit self allows all this craziness to exist
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