What happens is that the second over write the first. Therefor it does'nt make sense to have two constructors. The constructor is some code that are run every time you create an object. I hope this will help you clear some doubts, and since you've already received good answers to the other questions I will stop here :)Ĭlasses are simply blueprints to create objects from. Now, if you want custom values for the x attribute all you have to do is pass that value as argument to _init_: class Test(object): That argument is conventionally named self.Ĭlass methods, such as the constructor _new_, instead receive the class as their first argument. T.x = 10 # here you're building your object tīut if you want every instance of Test to have an attribute x equal to 10, you can put that code inside _init_: class Test(object):Įvery instance method (a method called on a specific instance of a class) receives the instance as its first argument. The purpose of the initialiser C._init_ is to define custom initialisation of each instance of C after it is created.įor example Python allows you to do: class Test(object): The purpose of the constructor C._new_ is to define custom behaviour during construction of a new C instance. Other methods do not receive this treatment. How are they different from methods in a class?Īs stated in the official documentation _init_ is called after the instance is created. So that method is the initialiser for new instances of C. The C._init_ instance method is called on a specific instance, after it is created, to initialise it before being passed back to the caller. So the C._new_ class method is the constructor for the class C. The constructor (named _new_) creates and returns a new instance of the class. Why are constructors indeed called "Constructors" ?
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