Top 25 Interview Questions on Python Language for 2025
Python remains one of the most in-demand programming languages, known for its simplicity, readability, and versatility. As we move toward 2025, Python continues to be a go-to language for developers working in web development, data science, artificial intelligence, machine learning, and more. If you’re preparing for a Python interview, mastering these Top 25 Interview Questions on Python Language for 2025 will give you a competitive edge.
1. What is Python?
Answer: Python is a high-level, interpreted, and dynamically typed programming language. Created by Guido van Rossum in 1991, Python emphasizes code readability and allows developers to express concepts in fewer lines of code.
2. What are the key features of Python?
Answer: Key features of Python include:
- Easy to Learn and Read: Python has a simple syntax that makes it easy for beginners to learn.
- Interpreted Language: Python code is executed line-by-line, making it easier to debug.
- Cross-Platform: Python can run on various platforms without modification.
- Extensive Libraries: Python comes with a rich set of libraries and frameworks.
- Dynamically Typed: Data types are determined at runtime, making it flexible and reducing development time.
3. What is the difference between Python 2 and Python 3?
Answer: Python 3 is the latest version, with several improvements over Python 2, such as better Unicode handling, new syntax features, and enhanced libraries. Python 2 is no longer supported, and Python 3 is recommended for all new projects.
4. What are Python’s data types?
Answer: Python supports several built-in data types, including:
- Numeric types:
int,float,complex - Sequence types:
list,tuple,range - Text type:
str - Mapping type:
dict - Set types:
set,frozenset - Boolean type:
bool - Binary types:
bytes,bytearray,memoryview
5. What is the difference between a list and a tuple in Python?
Answer:
- List: Mutable, meaning it can be modified after creation. Lists are created using square brackets (
[]). - Tuple: Immutable, meaning its values cannot be changed once defined. Tuples are created using parentheses (
()).
6. What are Python functions?
Answer: Python functions are blocks of reusable code that are used to perform a specific task. Functions are defined using the def keyword and can accept parameters and return values.
7. What is a lambda function in Python?
Answer: A lambda function is an anonymous, small function defined using the lambda keyword. It can take any number of arguments but can only have one expression. For example: lambda x: x + 1.
8. What is the purpose of the self keyword in Python?
Answer: The self keyword refers to the instance of the class. It allows access to the instance’s attributes and methods. It is used within object-oriented classes to reference the current object.
9. What is inheritance in Python?
Answer: Inheritance is a feature in object-oriented programming that allows one class to inherit the properties and methods of another. This helps in code reusability and extension. In Python, inheritance is implemented by passing the parent class to the child class.
10. What are Python decorators?
Answer: Decorators are functions that modify the functionality of another function. They are used to add extra functionality to functions or methods without modifying their structure. A decorator is applied using the @ symbol.
11. What is the difference between is and == in Python?
Answer:
is: Compares the memory location (identity) of two objects.==: Compares the values of two objects.
12. What are Python modules and packages?
Answer:
- Module: A Python file containing definitions, functions, and variables that can be used in other Python programs.
- Package: A collection of Python modules grouped together in a directory hierarchy.
13. What is exception handling in Python?
Answer: Python handles exceptions using try, except, else, and finally blocks. The try block contains code that may raise an exception, while the except block handles the exception. The else block executes if no exception occurs, and the finally block runs regardless of whether an exception occurred.
14. What are Python’s built-in data structures?
Answer: Python has several built-in data structures, including:
- List: Ordered, mutable collection of items.
- Tuple: Ordered, immutable collection of items.
- Set: Unordered collection of unique elements.
- Dictionary: Unordered collection of key-value pairs.
15. What is the difference between del, remove(), and pop() in Python?
Answer:
del: Deletes an element from a list by index or removes an entire object.remove(): Removes the first occurrence of a specified value from a list.pop(): Removes and returns an element at a specified index.
16. What is Python’s garbage collection?
Answer: Garbage collection in Python is the process of automatically reclaiming memory by deleting objects that are no longer in use. This is handled by Python’s built-in garbage collector, which uses reference counting and cyclic garbage collection.
17. What is list comprehension in Python?
Answer: List comprehension is a concise way to create lists in Python. It allows you to construct a new list by applying an expression to each item in an iterable. For example: [x*2 for x in range(5)] creates a list [0, 2, 4, 6, 8].
18. What is a generator in Python?
Answer: A generator is a function that returns an iterable set of items, one at a time, using the yield keyword. Generators are memory efficient as they generate values on-the-fly rather than storing them in memory.
19. What is Python’s Global Interpreter Lock (GIL)?
Answer: The Global Interpreter Lock (GIL) is a mechanism that ensures only one thread executes Python bytecode at a time. This can limit performance in CPU-bound programs, but it doesn’t affect I/O-bound programs much.
20. What is the difference between range() and xrange() in Python?
Answer:
range(): Returns a list in Python 2 (but a generator in Python 3).xrange(): Returns an iterator in Python 2, and is more memory efficient thanrange().
21. How does Python handle memory management?
Answer: Python uses a private heap space for memory management. The memory is managed by the Python memory manager, which includes tools like garbage collection and reference counting.
22. What are Python’s built-in functions?
Answer: Python has many built-in functions such as len(), type(), min(), max(), sorted(), abs(), and more. These functions can be used directly without needing to import any libraries.
23. How can you make a class in Python?
Answer: A class in Python is defined using the class keyword. It can contain attributes (variables) and methods (functions) to define its behavior. Example:
class Dog:
def __init__(self, name, breed):
self.name = name
self.breed = breed
24. What is the use of with statement in Python?
Answer: The with statement is used to wrap the execution of a block of code within methods defined by a context manager. It ensures that resources, such as files, are properly cleaned up after use, even if an exception is raised.
25. What is the difference between deep copy and shallow copy in Python?
Answer:
- Shallow copy: Copies the reference of the objects, not the objects themselves.
- Deep copy: Copies both the object and the objects it refers to, ensuring that changes to the copy don’t affect the original.
Conclusion
Python’s versatility and simplicity make it a powerful language for developers, especially as we enter 2025. By mastering these Top 25 Interview Questions on Python Language for 2025, you will have a strong foundation for excelling in your Python interviews. Stay updated with the latest advancements, practice coding regularly, and keep honing your skills.