OOPS - Python

_____ represents an entity in the real world with its identity and behaviour.

• A method

• An object

• A class

• An operator

What type of inheritance is illustrated in the following Python code?

class A():

pass

class B():

pass

class C(A,B):

pass

• Multi-level inheritance

• Multiple inheritance

• Hierarchical inheritance

• Single-level inheritance

What will be the output of the following Python code?

class A:

def __init__(self):

self._x = 5

class B(A):

def display(self):

print(self._x)

def main():

obj = B()

obj.display()

main()

• Error, invalid syntax for object declaration

• Nothing is printed

• 5

• Error, private class member can’t be accessed in a subclass

What will be the output of the following Python code?

def say(message, times = 1):

print(message * times)

say('Hello')

say('World', 5)

• Hello

  WorldWorldWorldWorldWorld

• Hello

  World 5

• Hello

  World,World,World,World,World

• Hello

  HelloHelloHelloHelloHello

What will be the output of the following Python code?

def func(a, b=5, c=10):

print('a is', a, 'and b is', b, 'and c is', c)

func(3, 7)

func(25, c = 24)

func(c = 50, a = 100)

• a is 7 and b is 3 and c is 10

  a is 25 and b is 5 and c is 24

  a is 5 and b is 100 and c is 50

• a is 3 and b is 7 and c is 10

  a is 5 and b is 25 and c is 24

  a is 50 and b is 100 and c is 5

• a is 3 and b is 7 and c is 10

  a is 25 and b is 5 and c is 24

  a is 100 and b is 5 and c is 50

• Error

What will be the output of the following Python code?

a=10

b=20

def change():

global b

a=45

b=56

change()

print(a)

print(b)

• 10

  56

• 45

  56

• 10

  20

• Error

How are variable length arguments specified in the function heading?

• one star followed by a valid identifier

• one underscore followed by a valid identifier

• two stars followed by a valid identifier

• two underscores followed by a valid identifier

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()

• test of B called

  test of C called

• test of C called

  test of B called

• test of B called

• Error, both the classes from which D derives has same method test()

What is the difference between a class and an object?

• A class is a blueprint to make an object
• An object is a blueprint to make a class
• A blueprint is an object to make a class
• Blueprint class is an object make a

These have identity, state, and behavior.

• class
• object
• method
• void