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Python Programming Interview Questions

Top 50 high-demand Python interview questions with clear, industry-ready answers.

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Top 50 Python Interview Questions

Frequently asked in product companies, startups, and MNCs.

1. What is Python?⌄

Python is a high-level, interpreted, dynamically typed programming language known for its simplicity and readability.

2. Key features of Python?⌄

Easy syntax, interpreted, dynamically typed, object-oriented, extensive libraries, and cross-platform support.

3. Python is interpreted or compiled?⌄

Python is interpreted; code is executed line by line by the Python interpreter.

4. What is PEP 8?⌄

PEP 8 is the official style guide for writing clean and readable Python code.

5. What are Python data types?⌄

int, float, complex, str, list, tuple, set, dict, and bool.

6. Difference between list and tuple?⌄

Lists are mutable; tuples are immutable.

7. What is a dictionary?⌄

A dictionary stores data as key-value pairs.

8. What is a set?⌄

A collection of unordered, unique elements.

9. What is dynamic typing?⌄

Variable types are determined at runtime, not at compile time.

10. What is indentation in Python?⌄

Indentation defines code blocks and is mandatory in Python.

11. What is a function?⌄

A reusable block of code that performs a specific task.

12. What is lambda function?⌄

An anonymous single-expression function defined using the lambda keyword.

13. What is list comprehension?⌄

A concise way to create lists using expressions and loops.

14. What is a module?⌄

A file containing Python code such as functions and variables.

15. What is a package?⌄

A collection of related Python modules.

16. What is OOP in Python?⌄

Python supports OOP concepts like classes, objects, inheritance, and polymorphism.

17. What is a class?⌄

A blueprint for creating objects.

18. What is an object?⌄

An instance of a class.

19. What is inheritance?⌄

Allows a class to acquire properties of another class.

20. What is polymorphism?⌄

Ability of different objects to respond differently to the same method.

21. What is encapsulation?⌄

Restricting access to data using access modifiers.

22. What is abstraction?⌄

Hiding internal implementation details.

23. What is __init__ method?⌄

A constructor method that initializes object data.

24. What is self keyword?⌄

Represents the current object of a class.

25. What is exception handling?⌄

Handling runtime errors using try, except, else, and finally.

26. What is finally block?⌄

Code that always executes whether exception occurs or not.

27. What is file handling?⌄

Reading and writing files using open(), read(), write(), close().

28. What is with statement?⌄

Ensures proper resource management like file closing.

29. What is generator?⌄

A function that yields values using yield keyword.

30. Difference between generator and iterator?⌄

Generators are easier to implement and use yield.

31. What is multithreading?⌄

Executing multiple threads simultaneously.

32. What is GIL?⌄

Global Interpreter Lock ensures only one thread executes Python bytecode at a time.

33. What is multiprocessing?⌄

Running multiple processes to achieve parallelism.

34. What is decorator?⌄

A function that modifies another function’s behavior.

35. What is map() function?⌄

Applies a function to all items in an iterable.

36. What is filter() function?⌄

Filters elements based on a condition.

37. What is reduce() function?⌄

Applies rolling computation to reduce iterable to single value.

38. What is shallow copy?⌄

Copies references of objects.

39. What is deep copy?⌄

Creates completely independent copies of objects.

40. What is mutable vs immutable?⌄

Mutable objects can change; immutable objects cannot.

41. What is None?⌄

Represents absence of a value.

42. What is pass statement?⌄

Acts as a placeholder where a statement is required.

43. What is break and continue?⌄

break exits loop; continue skips current iteration.

44. What is zip() function?⌄

Combines multiple iterables into tuples.

45. What is enumerate() function?⌄

Returns index and value from iterable.

46. What is *args and **kwargs?⌄

Used to pass variable number of arguments.

47. What is virtual environment?⌄

Isolated environment for managing project dependencies.

48. What is pip?⌄

Python package installer.

49. What is __name__ == "__main__"?⌄

Ensures code runs only when file is executed directly.

50. Python vs Java?⌄

Python is dynamically typed and simpler; Java is statically typed and faster at runtime.

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