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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
- 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
- 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
- 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"
- 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?
- How can I create a self-signed certificate for localhost?
I've gone through the steps detailed in How do you use HTTPS and SSL on 'localhost'?, but this sets up a self-signed certificate for my machine name, and when browsing it via https: localhost, I receive the Internet Explorer warning Is there a way to create a self-signed certificate for "localhost" to avoid this warning?
- How can I generate a self-signed SSL certificate using OpenSSL?
A self-signed certificate does not chain back to a trusted anchor The best way to avoid this is: Create your own authority (i e , become a CA) Create a certificate signing request (CSR) for the server Sign the server's CSR with your CA key Install the server certificate on the server Install the CA certificate on the client
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