*Creating & Using Custom Modules*

*What is a Module?*
A module is just a .py file containing functions, variables, or classes you can reuse across other files.

*Why Use Modules?*
Reuse code
Keep things organized
Avoid repetition
Easier to debug and collaborate

*Example: Create a Custom Module*

mymath.py
python
def add(a, b):
return a + b

def square(x):
return x ** 2


main.py
python
import mymath

print(mymath.add(2, 3)) Output: 5
print(mymath.square(4)) Output: 16


*Using from Keyword:*
python
from mymath import add

print(add(10, 5))


*Tip: Where to Store It?*
Place the module .py in the same folder as your script
Or add the folder path to PYTHONPATH

*Mini Project: Make a Utility Module*

utils.py
python
def is_even(n):
return n % 2 == 0

def greet(name):
return fHello, name!


app.py
python
from utils import is_even, greet

print(greet(Deepak))
print(Is 10 even?, is_even(10))


*Make your code modular, readable & scalable!*