MCQs Classes and Objects Advanced Python Programming

MCQs Classes and Objects

1. What is setattr() used for?

• To set or change the value of an attribute of object
• To access the attribute of the object
• To set an attribute for new class
• To set an attribute inside the function

Ans: To set or change the value of an attribute of object

2. What is getattr() used for?

• To access the attribute of the object
• To get the default value of an attribute
• To get an attribute of class with no object
• To check if an attribute exists or not

Ans: To access the attribute of the object

3. The assignment of more than one function to a particular operator is _______.

• Operator over-assignment
• Operator overriding
• Operator overloading
• Operator instance

Ans: Operator overloading

4. Which of the following is not a class method?

• Bounded
• Unbounded
• Non-static
• Static

Ans: Non-static

5. What is hasattr(obj,name) used for?

• To check if an attribute exists or not
• To check an object of a class
• To check whether the attribute is an integer or not
• To check the attribute is assigned with value or not

Ans: To check if an attribute exists or not

6. What is delattr(obj,name) used for?

• To delete an attribute along with that object
• To delete the value of the attribute
• To check if an attribute is deleted or not
• To delete an attribute

Ans: To delete an attribute

7. __del__ method is used to destroy instances of a class. True or False?

• FALSE
• TRUE

Ans: TRUE

8. What does print(Test.__name__) display (assuming Test is the name of the class) ?

• Exception is thrown
• __main__
• ()
• Test

Ans: Test

9. What is the output of the following code? 

class change:
def __init__(self, x, y, z):
self.a = x + y + z 

x = change(1,2,3)
y = getattr(x, 'a')
setattr(x, 'a', y+1)
print(x.a)

• 0
• 7
• 8
• 6

Ans: 7

10. What is the output of the following piece of code?

 class objects:
def __init__(self):
    self.colour = None
    self._shape = "Circle" 
def display(self, s):
    self._shape = s
obj=objects()
print(obj._objects_shape)

• Error because the ‘objects’ object has no attribute ‘_objects_shape’
• The program runs fine because name mangling has been properly implemented
• Error because the proper syntax for name mangling hasn’t been implemented
• Error because the member shape is a protected member

Ans: Error because the ‘objects’ object has no attribute ‘_objects_shape’

11. What is the output of the following code? 

 class Demo:
    def __init__(self):
        self.a = 1
        self.__b = 1
    def display(self):
        return self.__b

obj = Demo()
print(obj.__b)

• The program has an error because b is private and display(self) is returning a private member
• The program runs fine and 1 is printed
• The program has an error because there isn’t any function to return self.a
• The program has an error because b is private and hence can’t be printed

Ans: The program has an error because b is private and hence can’t be printed

12. What is the output of the following code?

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

• The program has an error because b is private and hence can’t be printed
• The program runs fine and 1 is printed
• The program has an error because b is private and display(self) is returning a private member
• The program has an error because there isn’t any function to return self.a

Ans: The program runs fine and 1 is printed

13. What is the output of the following code?

class test:
    def __init__(self):
           self.variable = 'Old'
           self.Change(self.variable)
    def Change(self, var):
          var = 'New'
obj=test()
print(obj.variable)
 

• ‘Old’
• ‘New’ is printed
• Error because function change can’t be called in the __init__ function
• Nothing is printed

Ans: ‘Old’

 14. Is the following piece of code correct?

class A:
def __init__(self,b):
self.b=b
def display(self):
print(self.b)
obj=A("Hello")
del obj

• TRUE
• FALSE

Ans: TRUE

 15. What is the output of the following code?

class Demo:
    def __init__(self):
        pass

    def test(self):
        print(__name__)
obj = Demo()
obj.test()

• Demo
• test
• __main__
• Exception is thrown

Ans: __main__

 16. What is the output of the following code?

class demo():
    def __repr__(self):
        return '__repr__ built-in function called'
    def __str__(self):
        return '__str__ built-in function called'
s=demo()
print(s)

• __str__ built-in function called
• __repr__ built-in function called
• Error
• Nothing is printed

Ans: __str__ built-in function called

17. What is the output of the following piece of code? 

class stud:

    'Base class for all students'

    def __init__(self, roll_no, grade):

        self.roll_no = roll_no

        self.grade = grade

    def display (self):

        print("Roll no : ", self.roll_no, ", Grade: ", self.grade)

print(stud.__doc__)

• __main__
• Exception is thrown
• Nothing is displayed
• Base class for all students

Ans: Base class for all students

 18. What is the output for the following piece of 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)

• The program runs properly and prints 1
• The program has an error because the value of members of a class can’t be changed from outside the class
• The program runs properly and prints 45
• The program has an error because the value of members outside a class can only be changed as self.a=45

Ans: The program runs properly and prints 45

Statement: Mr. Prasanna has his own serviced apprtment given rent for daily basis. Guests can book the rooms online through www.booking.com. In order to maintain the guest register, Prasanna wants an application which gives him the booking details.Booking details include booking id, guest name, room no and the price. Write a Python code to take the details of booking and display the same.Create a class “Booking” with the following attributes. Initialize the constructor using __init__ and use display method to display the details. Data type Attribute Integer bookingid String guestname String roomno Integer price.

Answer the below questions by considering the above statement.

19. What is the name of the class? 

• BookingDetails
• Bookings
• Main
• Booking

Ans: Booking

20. How many attributes does the class have?_____________

Ans: 4

21. Choose the right way to define the attributes inside the init method?

• def __init__(self,a,b,c,d) self.bookingid=a self.guestname=b self.roomno=c self.price=d
• def __init__(a,b,c,d): self.bookingid=a self.guestname=b self.roomno=c self.price=d
• def __init__(self,a,b,c,d): self.bookingid=a self.guestname=b self.roomno=c self.price=d
• def __init__(self,a,b,c,d): bookingid=a guestname=b roomno=c price=d

Ans: def init(self,a,b,c,d): self.bookingid=a self.guestname=b self.roomno=c self.price=d

22. How many methods does the class have?

• 1
• 4
• 2
• 3

Ans: 2

23. What is the name of the method present inside the class?

• display
• bookingdetails
• booking
• guestname

Ans: display

24. How many arguments does the method ‘display’ have?

• 0
• 1
• 2
• 3

Ans: 0

25. Choose the correct ‘display’ method definition?

• def display(self) print”Booking ID: “,bookingid print”Guest Name: “,guestname print”Room Number: “,roomno print”Price of the Room: %s Rs”%price
• def display(self): print”Booking ID: “,self.bookingid print”Guest Name: “,self.guestname print”Room Number: “,self.roomno print”Price of the Room: %s Rs”%self.price
• def display(self): print”Booking ID: “,bookingid print”Guest Name: “,guestname print”Room Number: “,roomno print”Price of the Room: %s Rs”%price
• def display(): print”Booking ID: “,bookingid print”Guest Name: “,guestname print”Room Number: “,roomno print”Price of the Room: %s Rs”%price

Ans: def display(self): print”Booking ID: “,self.bookingid print”Guest Name: “,self.guestname print”Room Number: “,self.roomno print”Price of the Room: %s Rs”%self.price

26. How to instantiate the class?

• self.b=Booking(2018051001,”Yashas Chandra”,”R5″,2400)
• b=Booking(2018051001,”Yashas Chandra”,”R5″,2400)
• b=Booking(self, 2018051001,”Yashas Chandra”,”R5″,2400)
• Booking b=Booking(2018051001,”Yashas Chandra”,”R5″,2400)

Ans: b=Booking(2018051001,”Yashas Chandra”,”R5″,2400)

27. How to call the method present inside the class?

• b.display()
• Booking.display()
• display()
• bookingid.display()

Ans: b.display()

28. How to store multiple guests’ Booking details?

• tuple
• list
• dictionary
• all of the above

Ans: all of the above

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