Python Programming Quiz

Quiz on Class in Python

Time left: 300 seconds

Q.1. In Python, a class is ___________ for a concrete object.

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It is the definition of a class

Q.2. How to create a constructor in python?

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The __init__() method is called the constructor and it is always called when an object is created in Python.

Q.3. If a properties of two classes are derived into one then it is called

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Mulitple inheritance is the type of inheritance where 1 class is derived from the properties of 2 base classes

Q.4. Which keyword is used to declare a class?

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'class' is a reserved keyword in Python. It is used to declare classes.

Q.5. What will be the output of the following code snippet? 
          
            class Employee:
                def __init__(self, id):
                    self.id = id

            e = Employee(123)
            print(e.id)

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123 is passed to the constructor when the object e of Employee class is created. Within the constructor, the value 123 is then assigned to local variable id of the class.

Q.6. what is numpy in below line 
          
            import numpy as np

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numpy is a Python library which is used for working with arrays. Here, the import statement searches for the module and makes the module code available in our file.

Q.7. What method is used to invoke a parent constructor from child class?

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super() is a built-in function that gives access to the methods and properties of a parent class when called from the child class.

Q.8.If properties of class is derived into two or more classes then is it called

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In Hierarchical inheritance, muliple child class are derived from 1 base class.

Q.9. What is setattr() used for?

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setattr() is a function that sets the value of the attribute of an object.

Q.10. What is dist in below line? 
          
            from math import dist

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In given statement, we are importing a particular class (dist) from a module (math).

Q.11. What will the list contain in following program? 
          
            class Test:
                def __init__(self,n):
                    pass
            l=[]
            for i in range(5):
                l.append(Test(i))
            print(l)

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For i through 0 to 4, a new object of class Test is appended in the list. Hence, the list will contain 5 objects of the Test class.

Q.12. What will be the output of the following code snippet: 
          
            class Test:
                def __init__(self,n):
                    self.n = n
                def area(self):
                    print(self.n*self.n)
            t = Test(5)
            t.area()

Select Your Option

5 is passed to the constructor of Test class when the object t is created. Inside the constructor, the value 5 is assigned to variable n of the class Test which is then squared and printed in the area() method.

Q.13. How can we check whether an object is an instance of a class?

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isinstance() is a function that returns True if the object is of specified type otherwise it returns False.

Q.14. If a class C inherits from two other classes A and B (in order - A, B) and a super method is used to invoke constructor of parent then the constructor invoked is of

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Python looks at the first class mentioned while inheriting in the child class. Since, given order is A,B - Python will first check the first class (ie, A) to see if it has the constructor defined, if it is defined, then it will execute that constructor. If the constructor is not defined in the first class, then Python will check the second class. Here, the order of inheritance matters to check which base class constructor will execute.

Q.15. The functions defined inside the class are called

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While a function returns a value, a procedure does not. A method is similar to a function but it is defined inside a class.

Instructions:-

  1. This Quiz is based on Dictionary in Python
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