Interview question and answer of Python developer for fresher

1. What is Python?

Python is a high-level, interpreted programming language known for its simplicity and readability. It supports multiple programming paradigms including procedural, object-oriented, and functional programming.

2. What are the key features of Python?

Python has simple syntax, dynamic typing, automatic memory management, a vast standard library, and supports modules and packages for modular programming. It is cross-platform and has a large community.

3. What are Python’s data types?

Common data types include integers, floats, strings, lists, tuples, sets, and dictionaries. Python is dynamically typed, so you do not need to declare variable types explicitly.

4. How do you create a function in Python?

Using the def keyword:

python

def add(a, b): return a + b

5. What is a list and how is it different from a tuple?

A list is mutable (can be changed), ordered collection of elements. Tuple is immutable (cannot be changed) but also ordered. Tuples are faster and used to store fixed data.

6. Explain the concept of Python’s indentation.

Indentation in Python defines blocks of code. Unlike many languages using braces {}, Python uses indentation whitespace for readability and structure.

7. What is a dictionary in Python?

A dictionary is an unordered collection of key-value pairs, where keys must be unique and values can be any data type.

8. What is the difference between == and is operator?

== checks for equality of values, whereas is checks if two references point to the same object in memory.

9. What are Python modules and packages?

A module is a single Python file (.py) containing related functions and classes. A package is a directory containing multiple modules along with an init.py file.

10. What are exception handling constructs in Python?

Use try, except, else, and finally blocks to handle exceptions.

Example:

python

try: x = 1 / 0 except ZeroDivisionError: print("Cannot divide by zero") finally: print("Execution complete")

11. How do you handle files in Python?

Using open() method with modes like 'r' for read, 'w' for write, and 'a' for append. Always close files after operations or use with block to auto-close.

12. What is Object-Oriented Programming (OOP) in Python?

OOP is a programming paradigm based on objects with attributes and methods. Python supports classes, inheritance, encapsulation, polymorphism, and abstraction.

13. How to create a class and an object in Python?

python

class Person: def init(self, name): self.name = name p = Person("Alice") print(p.name) # Output: Alice

14. What are Python’s built-in data structures?

Lists, tuples, sets, and dictionaries.

15. How do you iterate over a list?

Using a for loop:

python

for item in my_list: print(item)

These foundational questions cover core Python knowledge freshers are expected to know. Preparing clear, concise answers with simple examples demonstrates readiness for entry-level Python developer roles.

For practice, coding exercises on data types, functions, control flow, and basic OOP in Python will solidify skills.