Python OOP Test – 2

1. What type of inheritance is illustrated in the following Python code?

class A():
    pass
class B(A):
    pass
class C(B):
    pass

2. What does single-level inheritance mean?

3. What will be the output of the following Python code?

class A:
     def __init__(self):
         self.__i = 1
         self.j = 5
 
     def display(self):
         print(self.__i, self.j)
class B(A):
     def __init__(self):
         super().__init__()
         self.__i = 2
         self.j = 7  
c = B()
c.display()

4. What will be the output of the following Python code?

class A:
    def __init__(self,x=3):
        self._x = x        
class B(A):
    def __init__(self):
        super().__init__(5)
    def display(self):
        print(self._x)
def main():
    obj = B()
    obj.display()

main()

5. What will be the output of the following Python code?

>>> class A:
	pass
>>> class B(A):
	pass
>>> obj=B()
>>> isinstance(obj,A)

6. What will be the output of the following Python code?

class A:
    def test1(self):
        print(" test of A called ")
class B(A):
    def test(self):
        print(" test of B called ")
class C(A):
    def test(self):
        print(" test of C called ")
class D(B,C):
    def test2(self):
        print(" test of D called ")        
obj=D()
obj.test()

7. What will be the output of the following Python code?

class A:
    def __init__(self):
        self.__x = 1
class B(A):
    def display(self):
        print(self.__x)
def main():
    obj = B()
    obj.display()
main()

8. What will be the output of the following Python code?

class A:
    def __init__(self,x):
        self.x = x
    def count(self,x):
        self.x = self.x+1
class B(A):
    def __init__(self, y=0):
        A.__init__(self, 3)
        self.y = y
    def count(self):
        self.y += 1     
def main():
    obj = B()
    obj.count()
    print(obj.x, obj.y)
main()

9. What will be the output of the following Python code?

class A:
    def test(self):
        print("test of A called")
class B(A):
    def test(self):
        print("test of B called")
        super().test()  
class C(A):
    def test(self):
        print("test of C called")
        super().test()
class D(B,C):
    def test2(self):
        print("test of D called")      
obj=D()
obj.test()

10. What will be the output of the following Python code?

class A:
    def __init__(self):
        self._x = 5       
class B(A):
    def display(self):
        print(self._x)
def main():
    obj = B()
    obj.display()
main()

11. Which of the following statements isn’t true?

12. Method issubclass() checks if a class is a subclass of another class.

13. Which of the following statements is true?