Concept of Object Oriented Programs in Python
practice.

What will be the output of the following Python code?

class Demo:
     def __init__(self):
         self.a = 1
         self.__b = 1
     def get(self):
         return self.__b
obj = Demo()
obj.a=45
print(obj.a)

What will be the output of the following Python code?

class fruits:
    def __init__(self):
        self.price = 100
        self.__bags = 5
    def display(self):
        print(self.__bags)
obj=fruits()
obj.display()

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

What will be the output of the following Python code?

class Demo:
     def __init__(self):
         self.a = 1
         self.__b = 1
 
     def get(self):
         return self.__b
 
obj = Demo()
print(obj.get())

What will be the output of the following Python code?

class A:
    def __init__(self):
        self.multiply(15)
        print(self.i)
 
    def multiply(self, i):
        self.i = 4 * i;
class B(A):
    def __init__(self):
        super().__init__()
 
    def multiply(self, i):
        self.i = 2 * i;
obj = B()

Methods of a class that provide access to private members of the class are called as . . . . . . . . and . . . . . . . .

Which principle of OOP is associated with the concept of "IS-A" relationship?

What will be the output of the following Python code?

class A:
    def __init__(self):
        self.multiply(15)
    def multiply(self, i):
        self.i = 4 * i;
class B(A):
    def __init__(self):
        super().__init__()
        print(self.i)
 
    def multiply(self, i):
        self.i = 2 * i;
obj = B()

Which of the following statements is true?

What will be the output of the following Python code?

class A():
    def disp(self):
        print("A disp()")
class B(A):
    pass
obj = B()
obj.disp()

Suppose B is a subclass of A, to invoke the __init__ method in A from B, what is the line of code you should write?

What will be the output of the following Python code?

class Test:
    def __init__(self):
        self.x = 0
class Derived_Test(Test):
    def __init__(self):
        self.y = 1
def main():
    b = Derived_Test()
    print(b.x,b.y)
main()

What is the purpose of the __del__ method in Python classes?

What will be the output of the following Python code?

class Demo:
    def __new__(self):
        self.__init__(self)
        print("Demo's __new__() invoked")
    def __init__(self):
        print("Demo's __init__() invoked")
class Derived_Demo(Demo):
    def __new__(self):
        print("Derived_Demo's __new__() invoked")
    def __init__(self):
        print("Derived_Demo's __init__() invoked")
def main():
    obj1 = Derived_Demo()
    obj2 = Demo()
main()

When defining a subclass in Python that is meant to serve as a subtype, the subtype Python keyword is used.

What is the main advantage of using polymorphism in object-oriented programming?

What is the benefit of using polymorphism in object-oriented programming?

What will be the output of the following Python code?

class A:
    def one(self):
        return self.two()    	
    def two(self):
        return 'A'   
class B(A):
    def two(self):
        return 'B'
obj2=B()
print(obj2.two())

What will be the output of the following Python code?

class student:
    def __init__(self):
        self.marks = 97
        self.__cgpa = 8.7
    def display(self):
        print(self.marks)
obj=student()
print(obj._student__cgpa)

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()