Modules and Packages

Modules are Python files you can import. Packages are folders of modules.

Importing Modules

import math
print(math.pi)       # 3.14159...
print(math.sqrt(16)) # 4.0

from random import randint
print(randint(1, 100))

Creating Your Own Module

# utils.py
def greet(name):
    return "Hello, " + name

# app.py
from utils import greet
print(greet("Python"))

Popular Built-in Modules

• math — Mathematical functions
• random — Random number generation
• datetime — Date and time handling
• os — Operating system interface
• json — JSON parsing