Python interview 100 questions

Top 100 Python Interview Questions (2025)

• Basic Python Interview Questions
• Intermediate Python Interview Questions
• Advanced Python Interview Questions
• Python Coding Interview Questions

Basic Python Interview Questions

1. What is Python, and what are its main features?
2. Explain Python's dynamic typing.
3. What is PEP 8 and why is it important?
4. How do you comment in Python?
5. List different data types in Python.
6. What is the difference between a list and a tuple?
7. How is memory managed in Python?
8. What is a dictionary in Python?
9. How do you write a for loop in Python?
10. Explain the use of range() in Python.
11. What are Python modules and packages?
12. What is the use of the 'self' keyword?
13. How is indentation used in Python?
14. What is the difference between == and is?
15. How do you create and use functions in Python?
16. What are mutable and immutable types?
17. What is the purpose of the pass statement?
18. How do you install external packages in Python?
19. What is a virtual environment?
20. How do you handle exceptions in Python?

Intermediate Python Interview Questions

21. What is list comprehension and its advantages?
22. Explain lambda functions with an example.
23. What is map(), filter(), and reduce()?
24. How do you read and write files in Python?
25. What are decorators in Python?
26. What is inheritance and how is it implemented?
27. Explain the use of super() function.
28. What are the built-in data structures in Python?
29. Differentiate between deep copy and shallow copy.
30. What are generators and how do you create them?
31. Explain iterators with an example.
32. How do you use *args and **kwargs?
33. What is a docstring?
34. What is the purpose of __init__.py?
35. Explain exception handling best practices.
36. What is a context manager?
37. What is the difference between append() and extend() methods?
38. How do you merge two dictionaries?
39. What is slicing in Python?
40. What is the use of zip() function?

Advanced Python Interview Questions

41. What is a metaclass?
42. Explain the concept of monkey patching.
43. What is the Global Interpreter Lock (GIL)?
44. How do you use threading and multiprocessing?
45. What are properties and property decorators?
46. What are descriptors in Python?
47. How do you implement abstract base classes?
48. What are dunder methods?
49. Explain the difference between classmethod and staticmethod.
50. What are closures in Python?
51. What is contextvars and where is it used?
52. How do you use type hints in Python?
53. What is coroutine? How does asyncio work?
54. How do you serialize and deserialize data (pickle, json)?
55. Explain weak references and use cases.
56. What is dependency injection?
57. Describe the use of __slots__.
58. Describe the differences between Python 2 and 3.
59. What is the MRO (method resolution order)?
60. How do you optimize Python code for performance?

Python Coding Interview Questions

61. Write a Python function to reverse a string.
62. How to check if a string is a palindrome?
63. Find the factorial of a number using recursion.
64. Write code to sort a list of integers.
65. Find the largest/smallest element in a list.
66. How to merge two sorted lists?
67. Write code to remove duplicates from a list.
68. Find the second largest number in a list.
69. Check if two strings are anagrams.
70. Write a function to check for prime numbers.
71. Generate Fibonacci series up to N terms.
72. Find all pairs in a list that sum to a specific value.
73. Write a function to flatten a nested list.
74. Count the occurrence of each element in a list.
75. Check for balanced parentheses in an expression.
76. Find the intersection of two lists.
77. Write a program to read a CSV file.
78. How to sort a dictionary by values?
79. Implement stack and queue using lists.
80. Write a binary search implementation.
81. Find the longest substring without repeating characters.
82. Group anagrams from a list of strings.
83. Find the missing number in a sequence.
84. Calculate the sum of digits of a number.
85. Write a function to compute the power of a number.
86. Detect a cycle in a linked list.
87. Implement a LRU cache.
88. Generate all permutations of a string.
89. Remove vowels from a string.
90. Sort a list of tuples by the second item.
91. Check if a number is a power of two.
92. Write a program to count vowels and consonants in a string.
93. Reverse words in a given sentence.
94. Find duplicates in a list.
95. Calculate the factorial iteratively and recursively.
96. Find the GCD of two numbers.
97. Implement a linked list in Python.
98. Write a binary tree traversal code (inorder, preorder, postorder).
99. Implement matrix multiplication.
100. Detect palindrome in a linked list.