🐍 Top 20 Python Interview Questions and Answers for 2025

🐍 Top 20 Python Interview Questions and Answers for 2025 20/07/2025 ~ Views: 124

1. What are Python’s key features?

Interpreted
High-level
Dynamically typed
Object-oriented
Extensive standard library
Platform independent

2. What is the difference between a list and a tuple?

list is mutable, tuple is immutable
list has more methods, slightly slower due to mutability
Use tuple when data should not change

3. What is a dictionary in Python?

An unordered, mutable collection of key-value pairs.
Defined with {}, keys must be immutable (e.g., strings, numbers, tuples).

4. What is list comprehension?

A concise way to create lists:

squares = [x**2 for x in range(10)]

5. What is the difference between is and ==?

== checks value equality
is checks object identity

a = [1,2]; b = [1,2]  
a == b → True  
a is b → False

6. **What are *args and kwargs?

*args collects positional arguments into a tuple
**kwargs collects keyword arguments into a dictionary

7. What is a Python generator?

A function that yields values one at a time using yield, saving state between calls.
Efficient for large datasets.

8. What is the difference between @staticmethod and @classmethod?

@staticmethod: no access to class or instance (self or cls)
@classmethod: receives class (cls) as first argument

9. What is the Global Interpreter Lock (GIL)?

A mutex in CPython that allows only one thread to execute Python bytecode at a time.
Limits multi-threaded performance.

10. What is the difference between deep copy and shallow copy?

Shallow copy copies object references
Deep copy copies everything recursively

Use copy.copy() and copy.deepcopy()

11. What is Pythonic code?

Code that follows idiomatic Python conventions:
Readable, clean, uses list comprehensions, unpacking, EAFP, etc.

12. What is the difference between range() and xrange()?

Python 3: xrange() is removed
range() returns an iterable (like xrange() did in Python 2)

13. What is the difference between a module and a package?

Module: a single .py file
Package: a folder with __init__.py and other modules

14. Explain duck typing in Python.

“If it walks like a duck and quacks like a duck, it’s a duck.”
Python cares about behavior (methods), not type.

15. What are Python decorators?

Functions that modify behavior of another function or method.
Example:

@my_decorator
def hello(): pass

16. What is the difference between del, remove(), and pop()?

del deletes by index or variable
remove() deletes by value
pop() removes and returns item by index

17. What are Python’s data types?

Numeric: int, float, complex
Sequence: list, tuple, range
Mapping: dict
Set: set, frozenset
Boolean: bool
Text: str

18. What is the difference between None and False?

None is the absence of a value (null)
False is a Boolean

None != False, but both are falsy in conditionals

19. What is the with statement used for?

Context manager. Automatically handles setup and teardown (e.g., closing files):

with open('file.txt') as f:
    data = f.read()

20. What is the difference between __str__() and __repr__()?

__str__() → user-friendly string
__repr__() → unambiguous developer-focused string (can recreate object if possible)

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