🌐 Flask — Web Development

pip install flask

from flask import Flask

app = Flask(__name__)

@app.route('/')
def home():
    return '<h1>Namaste! Flask chal raha hai! 🐍</h1>'

@app.route('/about')
def about():
    return '<h1>About Page</h1>'

if __name__ == '__main__':
    app.run(debug=True)

from flask import Flask, render_template, request

app = Flask(__name__)

@app.route('/')
def home():
    students = [
        {'name': 'Rahul', 'marks': 85},
        {'name': 'Priya', 'marks': 92},
    ]
    return render_template('index.html', students=students)

@app.route('/submit', methods=['POST'])
def submit():
    name = request.form['name']
    return f'Hello {name}!'

if __name__ == '__main__':
    app.run(debug=True)

# Chapter 24: Flask — Advanced Practice
print("=== Flask Practice ===")

# Example 1: Basic usage
result = "Python mein Flask bahut powerful hai!"
print(result)

# Example 2: Real world use
data = ["Flask", "Python", "Hindi", "PythonHindi.in"]
for item in data:
    print(f"Item: {item}")

print("\nPractice complete! Great job! 🎉")

# Chapter 24: Flask  Web Development — Advanced Examples
# Yeh code copy karo aur run karo!

# Example 1: Basic concept
print("=== Chapter 24: Flask  Web Development ===")

# Example 2: List operations
items = ["Python", "Hindi", "Code", "Practice"]
for i, item in enumerate(items, 1):
    print(f"{i}. {item}")

# Example 3: Dictionary usage
chapter_info = {
    "number": 24,
    "title":  "Flask  Web Development",
    "level":  "Advanced",
    "done":   False
}
for key, value in chapter_info.items():
    print(f"  {key:10}: {value}")

# Example 4: Function
def practice_summary(chapter, completed=False):
    status = "Complete ✅" if completed else "In Progress ⏳"
    return f"Chapter {chapter}: {status}"

print(practice_summary(24))
print(practice_summary(24, True))

# Step 1: Simple start
print("Python sikhna shuru karo!")

# Step 2: Variables use karo
language = "Python"
version  = 3.12
free     = True
print(f"{{language}} {{version}} — Free: {{free}}")

# Step 3: Loop se repeat karo
topics = ["Variables", "Loops", "Functions", "OOP"]
for topic in topics:
    print(f"  Learning: {{topic}}")

# Step 4: Function banao
def greet_learner(name, chapter):
    return f"Namaste {name}! Chapter {{chapter}} complete karo!"

print(greet_learner("Rahul", 22))

# Step 5: Dictionary se data store karo
progress = {{
    "completed": 22,
    "total":     30,
    "percent":   22/30*100
}}
print(f"Progress: {{progress['completed']}}/{{progress['total']}} ({{progress['percent']:.0f}}%)")