The distinction between “self” and “cls” is defined in PEP 8 . As Adrien said, this is not mandatory. It’s a coding style. PEP 8 says: Function and method arguments: Always use self for the first argument to instance methods. Always use cls for the first argument to class methods.
In order for that to work, you should define the C method like this: void cMethod(id param); and when you call it, call it like this: cMethod(self); then, you would be able to write: [param objcMethod]; In your cMethod. This is because the self variable is a special parameter passed to Objective-C methods automatically. Since … Read more
It is idiomatic to prefer to omit self. when invoking methods; it is generally never needed. You must use self.foo = xxx when calling a setter method, instead of foo = xxx, so that Ruby realizes that you are not trying create a new local variable. Similarly, in the unlikely event that you have an … Read more
Yes it is the same as this in Java and self in Objective-C, but with Swift, self is only required when you call a property or method from a closure or to differentiate property names inside your code, such as initializers. So you can use almost all of your class components safely without using self … Read more
Writing @age directly accesses the instance variable @age. Writing self.age tells the object to send itself the message age, which will usually return the instance variable @age — but could do any number of other things depending on how the age method is implemented in a given subclass. For example, you might have a MiddleAgedSocialite … Read more
you almost always want to access variables using the synthesized setters/getters, even if you aren’t doing anything special with them at the moment. if as your application develops, you find that you need to be doing further validation/formatting of variables, then you can just implement the required setter/getter method, and if you have used the … Read more
Adding an answer because Oskarbi’s isn’t explicit. You use self when: Defining an instance method. It is passed automatically as the first parameter when you call a method on an instance, and it is the instance on which the method was called. Referencing a class or instance attribute from inside an instance method. Use it … Read more
The reason you need to use self. is because Python does not use the @ syntax to refer to instance attributes. Python decided to do methods in a way that makes the instance to which the method belongs be passed automatically, but not received automatically: the first parameter of methods is the instance the method … Read more
The reason you need to use self. is because Python does not use the @ syntax to refer to instance attributes. Python decided to do methods in a way that makes the instance to which the method belongs be passed automatically, but not received automatically: the first parameter of methods is the instance the method … Read more
tl;dr You can fix this problem by making the Timed class a descriptor and returning a partially applied function from __get__ which applies the Test object as one of the arguments, like this class Timed(object): def __init__(self, f): self.func = f def __call__(self, *args, **kwargs): print(self) start = dt.datetime.now() ret = self.func(*args, **kwargs) time = … Read more