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Python Modules

A module is a file containing Python definitions and statements. Modules are used to break down large programs into small manageable and organized files.

Example 1: Creating and Using a Module

Create a module named greetings.py and import it.

# greetings.py

def say_hello(name):
    print(f"Hello, {name}!")

In another file:

# main.py
import greetings
greetings.say_hello("Karthick AG")

Hello, Karthick AG!

Example 2: Using from and import

Import specific functions from a module.

# math_operations.py

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

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

In another file:

# main.py
from math_operations import add
result = add(10, 5)
print("Result:", result)

Result: 15

Example 3: Renaming Modules Using as

Import a module with an alias.

# Importing with alias
import math as m
print("Square root of 16:", m.sqrt(16))

Square root of 16: 4.0

Example 4: Built-in Modules

Use Python's built-in modules like datetime and random.

# Using datetime module
import datetime
today = datetime.date.today()
print("Today's date:", today)

Today's date: 2023-10-05

Example 5: Installing and Using External Modules

Install and use the requests module to make HTTP requests.

# Install using pip
# pip install requests

# Using requests module
import requests
response = requests.get("https://api.github.com")
print("Status Code:", response.status_code)

Status Code: 200

Example 6: Exploring Module Search Path

Print the list of directories where Python looks for modules.

# Module search path
import sys
print("Module Search Path:")
for path in sys.path:
    print(path)

Output List of directories

Explanation: Modules help organize code and promote code reusability. You can create your own modules, use built-in modules, or install external modules using package managers like pip.

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