Python Interview Questions

1. Python Basics

1. Write a Python program to reverse a string.
2. How do you find the factorial of a number using recursion?
3. Write a program to check if a number is prime.
4. Find the second largest element in a list.
5. Print only duplicate characters in a string.
6. Explain difference between is and == in Python.
7. What are Python decorators? Give a simple example.
8. What is list comprehension? Write one example.
9. Explain mutable vs immutable with examples.
10. What are Python generators? Write a generator for Fibonacci numbers.

2. Python OOPs

11. What is the difference between @staticmethod, @classmethod, and normal methods?
12. Write a class Car with attributes brand, model, year and a method to display details.
13. Explain multiple inheritance in Python with example.
14. What is method overriding? Give an example.
15. Difference between __init__ and __new__.

3. File Handling & Data

16. Write a Python program to read a text file and count word frequency.
17. How to read/write JSON files in Python? Give an example.
18. Write code to extract email addresses from a text using regex.
19. Can Python read PDFs? Write sample code.
20. How to connect Python with SQL database (example with SQLite/MySQL)?

4. Testing with Python (Pytest & Selenium)

21. Write a pytest test case for login functionality with email & password.
22. Why do we use fixtures in pytest? Write a fixture to open & quit a browser.
23. Difference between implicit wait and explicit wait in Selenium.
24. Python Selenium → Take a screenshot of a webpage & save it locally.
25. Write code to handle dynamic elements using XPath in Selenium.
26. How do you select a value from a dropdown in Selenium (Python)?
27. Explain handling cookies in Selenium with Python.
28. Use ActionChains in Selenium to drag & drop an element.
29. Write Python code to verify if a file is downloaded (without relying on browser).
30. Can we read a PDF opened in browser with Selenium + Python? How?

5. API Testing with Python

31. Write Python code using requests library to send a GET request & print status code.
32. Write a POST request with JSON payload & print the response.
33. How do you send headers with a request in Python? Example.
34. How to assert response body in Python API tests?
35. Explain difference between response.text and response.json().

6. Advanced Python (Practice)

36. Write a Python program to implement multithreading.
37. Explain difference between multiprocessing and multithreading.
38. Write a function with @lru_cache decorator and explain caching.
39. Write a Python script to send an email.
40. Explain how you would test an ML model with Python.