Answer & Solution
Answer: Option A
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72. 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()
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()73. What is the purpose of the __del__ method in Python classes?
74. 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()
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()75. When defining a subclass in Python that is meant to serve as a subtype, the subtype Python keyword is used.
76. What is the main advantage of using polymorphism in object-oriented programming?
77. What is the benefit of using polymorphism in object-oriented programming?
78. 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())
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())79. 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)
class student:
def __init__(self):
self.marks = 97
self.__cgpa = 8.7
def display(self):
print(self.marks)
obj=student()
print(obj._student__cgpa)80. 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()
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()