Answer & Solution
Answer: Option C
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22. What is the purpose of the constructor (__init__ method) in a class in Python?
23. What will be the output of the following Python code?
>>> class A:
pass
>>> class B(A):
pass
>>> obj=B()
>>> isinstance(obj,A)
>>> class A:
pass
>>> class B(A):
pass
>>> obj=B()
>>> isinstance(obj,A)24. What will be the output of the following Python code?
class Demo:
def __init__(self):
self.x = 1
def change(self):
self.x = 10
class Demo_derived(Demo):
def change(self):
self.x=self.x+1
return self.x
def main():
obj = Demo_derived()
print(obj.change())
main()
class Demo:
def __init__(self):
self.x = 1
def change(self):
self.x = 10
class Demo_derived(Demo):
def change(self):
self.x=self.x+1
return self.x
def main():
obj = Demo_derived()
print(obj.change())
main()25. What is the purpose of using abstraction in object-oriented programming?
26. What will be the output of the following Python code?
class A:
def __str__(self):
return '1'
class B(A):
def __init__(self):
super().__init__()
class C(B):
def __init__(self):
super().__init__()
def main():
obj1 = B()
obj2 = A()
obj3 = C()
print(obj1, obj2,obj3)
main()
class A:
def __str__(self):
return '1'
class B(A):
def __init__(self):
super().__init__()
class C(B):
def __init__(self):
super().__init__()
def main():
obj1 = B()
obj2 = A()
obj3 = C()
print(obj1, obj2,obj3)
main()27. What will be the output of the following Python code?
class Demo:
def __init__(self):
self.a = 1
self.__b = 1
def display(self):
return self.__b
obj = Demo()
print(obj.a)
class Demo:
def __init__(self):
self.a = 1
self.__b = 1
def display(self):
return self.__b
obj = Demo()
print(obj.a)