Python Modules

Learn how to organize code using modules and understand different ways to import them.

A module is a Python file that contains code you can reuse (functions, classes, variables). Modules help you split large programs into manageable pieces.

Creating a Module

example.py

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

Importing a Module

import example

print(example.add(2, 3))  # 5

Import Variations

import math as m
from math import pi, e

Avoid from module import * because it pollutes the namespace.

Module Search Path

Python looks in:

• the current directory

• PYTHONPATH

• the standard library and site-packages

You can inspect this with:

import sys
print(sys.path)

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