Python Modules

A Module is a file containing Python code, such as functions, variables, and classes, that can be reused in other Python programs.

Modules help organize code and make it reusable.

Creating a Module

Create a Python file named mymodule.py.

mymodule.py

def greet(name):
    print("Hello", name)

Importing a Module

Use the import keyword to use a module.

Example

import mymodule

mymodule.greet("John")

Output:

Hello John

Import Specific Functions

You can import only the required function from a module.

Example

from mymodule import greet

greet("Alice")

Output:

Hello Alice

Import with Alias

The as keyword creates a shorter name for the module.

Example

import mymodule as mm

mm.greet("Bob")

Output:

Hello Bob

Import Multiple Functions

Example

from mymodule import greet, add

Import All Functions

Use * to import everything from a module.

Example

from mymodule import *

Using * is generally not recommended because it can make code harder to understand.

Access Module Variables

mymodule.py

company = "Tech58"

Example

import mymodule

print(mymodule.company)

Output:

Tech58

Built-in Modules

Python provides many built-in modules that can be imported directly.

Example

import math

print(math.sqrt(25))

Output:

5.0

Why Use Modules?

• Reuse code across multiple projects.
• Organize large applications.
• Reduce duplicate code.
• Improve code readability and maintenance.

Summary

• A module is a Python file containing reusable code.
• Use import to include a module.
• Use from module import function to import specific functions.
• Use as to create an alias.
• Modules can contain functions, variables, and classes.
• Python provides many built-in modules.