OOPs in Python

What is the output of the following code?

class A:

    def init(self):

        self.x = 1

class B(A):

    def init(self):

        super().__init__()

        self.y = 2

b = B()

print(b.x, b.y)

• 1 2

• Error

• 2 1

• None

What is the output of the following code?

class Animal:

    def speak(self):

        print("Animal speaks")

class Dog(Animal):

    def speak(self):

        print("Dog barks")

d = Dog()

d.speak()

• Animal speaks

• Dog barks

• Error

• None

Which of the following is true about multiple inheritance in Python?

• Python does not support multiple inheritance

• A class can inherit from only two parent classes

• A class can inherit from multiple parent classes

• Multiple inheritance is only possible with abstract classes

What is the output of the following code?

class A:

    def init(self):

        self.x = 1

    def method(self):

        print("Method of class A")

class B(A):

    def method(self):

        super().method()

        print("Method of class B")

b = B()

b.method()

• Method of class A

• Method of class B

• Method of class A

     Method of class B

• Error

Which of the following is used to implement abstraction in Python?

• @abstractmethod decorator

• abstract keyword

• interface keyword

• virtual keyword

What is the output of the following code?

class A:

    x = 1

a1 = A()

a2 = A()

a1.x = 2

print(a1.x, a2.x, A.x)

• 2 1 1

• 2 2 2

• 2 1 2

• Error

Which of the following is true about the `__init__` method in Python?

• It must return a value

• It is called automatically when a class is instantiated

• It can only have one parameter

• It is optional in all classes

What is the output of the following code?

class A:

    def str(self):

        return "Class A"

class B(A):

    pass

b = B()

print(b)

• Class A

• Class B

• <__main__.B object at ...>

• Error

Which of the following is an example of polymorphism in Python?

• Method overloading

• Method overriding

• Multiple inheritance

• All of the above

What is the output of the following code?

class A:

    def method(self):

        print("A's method")

class B(A):

    def method(self):

        print("B's method")

class C(B):

    def method(self):

        super().method()

        print("C's method")

c = C()

c.method()

• A's method

     C's method

• B's method

     C's method

• C's method

• A's method

     B's method

     C's method