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What do these lines print?class Base(): """ My base class """ __nb_instances = 0 def __init__(self): Base.__nb_instances += 1 self.id = Base.__nb_instancesclass User(Base): """ My User class """ def __init__(self): super().__init__() self.id = 89u = User()print(u.id)

Question

What do these lines print?class Base(): """ My base class """ __nb_instances = 0 def init(self): Base.__nb_instances += 1 self.id = Base.__nb_instancesclass User(Base): """ My User class """ def init(self): super().init() self.id = 89u = User()print(u.id)

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Solution

The code will print "89".

Here's the step-by-step explanation:

  1. The User class is a subclass of the Base class.

  2. When an instance of the User class is created with u = User(), the __init__ method of the User class is called.

  3. Inside the User class's __init__ method, super().__init__() is called. This calls the __init__ method of the superclass, which is Base.

  4. Inside the Base class's __init__ method, Base.__nb_instances is incremented by 1 and self.id is set to Base.__nb_instances. However, this self.id is the id of the Base class, not the User class.

  5. After the super().__init__() call, self.id is set to 89. This self.id is the id of the User class.

  6. When print(u.id) is called, it prints the id of the User instance u, which is 89.

This problem has been solved

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