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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 is SELF JOIN and when would you use it? [duplicate] You use a self join when a table references data in itself E g , an Employee table may have a SupervisorID column that points to the employee that is the boss of the current employee To query the data and get information for both people in one row, you could self join like this: select e1 EmployeeID, e1 FirstName, e1 LastName, e1 SupervisorID, e2 FirstName as SupervisorFirstName, e2 LastName
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
security - How do I create a self-signed certificate for code signing . . . This creates a self-signed (-r) certificate, with an exportable private key (-pe) It's named "My CA", and should be put in the CA store for the current user We're using the SHA-256 algorithm The key is meant for signing (-sky) The private key should be stored in the MyCA pvk file, and the certificate in the MyCA cer file