class Dog:def __init__(self):# missing line hered = Dog()print(d.age)Fill in the missing line of code, so that the output for this code is 5.

To achieve an output of 5 for d.age, you need to initialize the age attribute within the __init__ method of the Dog class. Here is the modified version of the code with the missing line filled in:

class Dog:
    def __init__(self):
        self.age = 5  # This line initializes the age attribute to 5

d = Dog()
print(d.age)

Explanation:

1. In the Dog class, the __init__ method acts as the constructor, which is called when creating a new instance of the class.
2. By adding self.age = 5 in the __init__ method, every time a Dog object is created, its age attribute will be set to 5.
3. When you create an instance of Dog with d = Dog(), and then access d.age, it will output 5 as required.

Final Answer

The missing line of code is self.age = 5.