🔹 What is a Python Library or Package?

• A library is a group of ready-made code that helps you do tasks easily.
• A package is a folder that contains many libraries or modules.

✅ You don’t need to write everything from scratch. Just import and use!

🔸 How to Install a Library?

pip install library_name

Example:

pip install numpy

🔹 Most Popular Python Libraries by Category

📊 1. Data Analysis & Math

✅ Example:

import numpy as np

a = np.array([1, 2, 3])
print(a * 2)  # Output: [2 4 6]

🤖 2. Machine Learning

✅ Example:

from sklearn.linear_model import LinearRegression
model = LinearRegression()

🌐 3. Web Development

✅ Flask Example:

from flask import Flask
app = Flask(__name__)

@app.route('/')
def home():
    return "Hello, World!"

🧪 4. Testing & Automation

✅ Selenium Example:

from selenium import webdriver
driver = webdriver.Chrome()
driver.get("https://google.com")

🧰 5. Utilities & Tools

✅ Example:

import os
print(os.getcwd())  # Show current folder

📚 6. Web Scraping

✅ Example:

import requests
from bs4 import BeautifulSoup

r = requests.get("https://example.com")
soup = BeautifulSoup(r.text, 'html.parser')
print(soup.title.text)

🖼️ 7. Image and Media

✅ Example:

from PIL import Image
img = Image.open("image.jpg")
img.show()

🐍 8. GUI (Desktop Apps)

✅ Tkinter Example:

import tkinter as tk
win = tk.Tk()
win.title("Hello App")
win.mainloop()

🧾 Summary Table

🧠 Final Tip:

Learn the library you need for your project.
You don’t have to learn all at once.

📣 Coming Up Next:

➡️ How to Create Your Own Python Package (Step-by-Step)