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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 += 99u = User()print(u.id)991100I don't know

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 += 99u = User()print(u.id)991100I don't know

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Solution

The code prints "100". Here's the step-by-step explanation:

  1. The Base class is defined with a private class variable __nb_instances initialized to 0. This variable is used to keep track of the number of instances of the class.

  2. The __init__ method of the Base class increments __nb_instances by 1 each time an instance is created and assigns the value of __nb_instances to the instance variable self.id.

  3. The User class is a subclass of Base. Its __init__ method first calls the __init__ method of the Base class using super().__init__(), which increments __nb_instances and assigns the value to self.id.

  4. Then, the User class's __init__ method increments self.id by 99.

  5. When u = User() is executed, an instance of User is created. This is the first instance of Base, so __nb_instances is incremented to 1 and self.id is set to 1. Then self.id is incremented by 99, so u.id is 100.

  6. Finally, print(u.id) prints "100".

This problem has been solved

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