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Most Asked Python Interview Questions (120 Questions)

Python Basics (20 Questions)

1. What is Python, and why is it popular?
2. What is the difference between Python 2 and Python 3?
3. What is PEP 8, and why is it important?
4. What are mutable and immutable objects in Python?
5. What is the difference between = and == operators?
6. Explain the is vs == operators.
7. What is the purpose of the pass statement?
8. How does Python handle memory management?
9. What is the Global Interpreter Lock (GIL)?
10. What is the difference between __name__ and __main__?
11. What are Python’s built-in data types?
12. How do you check the type of a variable in Python?
13. What is the id() function in Python?
14. How do you use f-strings for string formatting?
15. What is the difference between str.format() and f-strings?
16. How do you handle exceptions using try and except?
17. What is the None type in Python?
18. How do you use the global keyword?
19. What is dynamic typing in Python?
20. How do you use the random module to generate random numbers?

Control Flow (15 Questions)

21. How do you use if, elif, and else statements?
22. What is the difference between break and continue?
23. How do you use for and while loops?
24. What is a list comprehension, and how does it work?
25. How do you use the range() function in loops?
26. What is the enumerate() function, and how is it used?
27. How do you use the zip() function in loops?
28. What is the match statement in Python 3.10+?
29. How do you handle nested loops in Python?
30. What is the difference between for and while loops?
31. How do you use the else clause with loops?
32. What is short-circuit evaluation in Python?
33. How do you iterate over a dictionary’s keys and values?
34. What is the reversed() function in Python?
35. How do you simulate a do-while loop in Python?

Functions (20 Questions)

36. What is a lambda function, and when is it used?
37. How do you use *args and **kwargs in functions?
38. What is a decorator, and how do you create one?
39. What is the difference between a function and a method?
40. How do you handle default arguments in functions?
41. What is a closure, and how is it implemented?
42. How do you use the map() and filter() functions?
43. What is recursion, and what are its limitations in Python?
44. How do you use type hints in functions?
45. What is the functools.lru_cache decorator?
46. How do you return multiple values from a function?
47. What is the nonlocal keyword in nested functions?
48. How do you pass a function as an argument to another function?
49. What is the sorted() function, and how does it differ from list.sort()?
50. How do you use the key parameter in sorting functions?
51. What is function scope and the LEGB rule?
52. How do you use the functools.partial() function?
53. What is a pure function, and why is it important?
54. How do you document a function using docstrings?
55. What is the __call__() method in Python?

Data Structures (25 Questions)

56. What is the difference between a list and a tuple?
57. How do you use a dictionary in Python?
58. What is a set, and how does it differ from a list?
59. How do you implement a stack in Python?
60. How do you implement a queue in Python?
61. What is the difference between pop() and remove() in lists?
62. How do you use list Slicing in Python?
63. What is a dictionary comprehension?
64. How do you handle duplicate elements in a set?
65. What is the collections module, and what are its key classes?
66. What is a defaultdict in the collections module?
67. How do you use the Counter class in Python?
68. What is the difference between append() and extend() in lists?
69. How do you merge two dictionaries in Python?
70. What is a namedtuple in the collections module?
71. How do you perform set operations like union and intersection?
72. What is the heapq module, and how do you use it?
73. How do you implement a priority queue using heapq?
74. What is tuple unpacking in Python?
75. How do you reverse a list in Python?
76. What is the index() method for lists?
77. How do you check if an element exists in a list?
78. What is the get() method for dictionaries?
79. How do you convert a list to a set and vice versa?
80. What is a deque in the collections module?

Object-Oriented Programming (OOP) (15 Questions)

81. What is the difference between a class and an object?
82. How do you implement inheritance in Python?
83. What is the @property decorator, and how is it used?
84. What is the difference between staticmethod and classmethod?
85. How do you achieve encapsulation in Python?
86. What is method overriding in Python?
87. What is the __init__() method, and how is it used?
88. What is polymorphism, and how is it implemented in Python?
89. How do you use the super() function in Python?
90. What is the Method Resolution Order (MRO) in Python?
91. What is name mangling in Python?
92. How do you create a read-only property in Python?
93. What is an abstract class, and how do you create one?
94. How do you use the abc module for abstract classes?
95. What is the difference between instance and class variables?

Exception Handling (10 Questions)

96. What is an exception, and how do you handle it in Python?
97. How do you use try, except, else, and finally blocks?
98. How do you raise an exception in Python?
99. What is the difference between assert and raise?
100. How do you create a custom exception in Python?
101. What is the ValueError exception, and when is it raised?
102. What is the KeyError exception, and when is it raised?
103. How do you catch multiple exceptions in a single except block?
104. What is the traceback module, and how is it used?
105. How do you log exceptions using the logging module?

File Handling (5 Questions)

106. How do you open and read a file in Python?
107. What is the with statement, and why is it used in file handling?
108. How do you write to a file in Python?
109. How do you handle a FileNotFoundError in Python?
110. How do you read a CSV file using the csv module?

Modules and Packages (5 Questions)

111. What is the difference between a module and a package?
112. How do you create and use a Python module?
113. What is the __init__.py file in a package?
114. How do you use pip to install a package?
115. What is a virtual environment, and how do you create one?

Functional Programming and Algorithms (10 Questions)

116. What is a generator, and how do you create one in Python?
117. How do you use the yield keyword in Python?
118. What is the difference between a list comprehension and a generator expression?
119. How do you implement a binary search algorithm in Python?
120. How do you implement a merge sort algorithm in Python?