Classes and Objects in Python

31

What is the purpose of the @staticmethod decorator in Python classes?

A) It defines a method that belongs to the class rather than an instance B) It defines a static attribute C) It defines a global function D) It defines a constructor

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Answer & Solution

Answer: Option A

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32

Is the following Python code valid?

class B(object):
  def first(self):
    print("First method called")
  def second():
    print("Second method called")
ob = B()
B.first(ob)

A) It isn't as the object declaration isn't right B) It isn't as there isn't any __init__ method for initializing class members C) Yes, this method of calling is called unbounded method call D) Yes, this method of calling is called bounded method call

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Answer & Solution

Answer: Option C

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33

Which function overloads the == operator?

A) __eq__() B) __equ__() C) __isequal__() D) none of the mentioned

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Answer & Solution

Answer: Option A

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34

What will be the output of the following Python code?

class stud:
   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)
stud1 = stud(34, 'S')
stud1.age=7
print(hasattr(stud1, 'age'))

A) Error as age isn't defined B) True C) False D) 7

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Answer & Solution

Answer: Option B

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35

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

A) () B) Exception is thrown C) Test D) __main__

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Answer & Solution

Answer: Option C

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36

What is a constructor in Python classes?

A) A special method that is automatically called when an object is created B) A built-in function C) A method that creates an object D) A method that destroys an object

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Answer & Solution

Answer: Option A

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37

Which of the following Python code will print True?

a = foo(2)
b = foo(3)
print(a < b)

A)

class foo:
    def __init__(self, x):
        self.x = x
    def __lt__(self, other):
        if self.x < other.x:
            return False
        else:
            return True

B)

class foo:
    def __init__(self, x):
        self.x = x
    def __less__(self, other):
        if self.x > other.x:
            return False
        else:
            return True

C)

class foo:
    def __init__(self, x):
        self.x = x
    def __lt__(self, other):
        if self.x < other.x:
            return True
        else:
            return False

D)

class foo:
    def __init__(self, x):
        self.x = x
    def __less__(self, other):
        if self.x < other.x:
            return False
        else:
            return True

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Answer & Solution

Answer: Option C

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38

Which function overloads the + operator?

A) __add__() B) __plus__() C) __sum__() D) none of the mentioned

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Answer & Solution

Answer: Option A

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39

What is the purpose of the @classmethod decorator in Python classes?

A) It defines a method that belongs to the class and not the instance B) It defines a static method C) It defines a constructor D) It defines a destructor

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Answer & Solution

Answer: Option A

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40

What is the output of the following code:

class Parent:
 def init(self):
 print('Parent constructor')
class Child(Parent):
 def init(self):
 print('Child constructor')
obj = Child()

A) Child constructor B) Parent constructor C) An error will occur D) Child Parent

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Answer & Solution

Answer: Option A

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