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Concept of Object Oriented Programs in Python

Concept of Object Oriented Programs in Python Page-8 section-1

71
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?
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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()
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Answer & Solution
Answer: Option C
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73
What is the purpose of the __del__ method in Python classes?
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Answer: Option A
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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()
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Answer & Solution
Answer: Option B
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75
When defining a subclass in Python that is meant to serve as a subtype, the subtype Python keyword is used.
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Answer: Option B
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76
What is the main advantage of using polymorphism in object-oriented programming?
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Answer: Option A
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77
What is the benefit of using polymorphism in object-oriented programming?
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Answer: Option A
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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())
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Answer: Option D
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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)
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Answer & Solution
Answer: Option A
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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()
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Answer & Solution
Answer: Option C
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