Python Module

A module in Python is a single file (with a .py extension) that contains Python definitions and statements, such as functions, classes, and variables. Modules allow you to organize related code into separate files logically.

Creating and Importing a Module

To create a module, you simply write some Python code in a file with the .py extension. For example, let’s create a module named math_operations.py with a few functions:


# calculation.py

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

def subtract(a, b):
    return a - b

Importing the Module

You can use import to bring the module into another file, making its functions available to use:


import calculation

result = calculation.add(5, 4)
print(result)  # Output: 9

Importing Specific Functions or Variables

You can also import specific functions or variables from a module:


from calculation import add

result = add(10, 7)
print(result)  # Output: 17

Using Aliases

You can use as to create an alias for a module or function:


import calculation as ca

result = ca.subtract(10, 5)
print(result)  # Output: 5

Standard Library Modules

Python’s standard library provides a wide range of built-in modules, such as math, datetime, and random. You can import and use these without additional setup.


import math

print(math.sqrt(25))  # Output: 5.0

Python Module – Interview Questions

Q 1: What is a Python module?

Ans: A module is a file containing Python code (functions, variables, classes).

Q 2: How do you use a module in Python?

Ans: Using the import statement.

Q 3: Can a module contain functions and classes?

Ans: Yes, modules can contain both.

Q 4: What is a built-in module?

Ans: Modules included with Python, like math or os.

Q 5: Can you create your own module?

Ans: Yes, by saving Python code in a .py file.