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+# Flask Authentication Application
+
+A complete full-stack web application with user authentication built with Flask and SQLite.
+
+## 📁 Project Structure
+flask_app/
+├── app.py # Main Flask application
+├── database.py # Database setup and functions
+├── users.py # User authentication functions
+├── users.db # SQLite database
+├── requirements.txt # Python dependencies
+├── venv/ # Virtual environment
+└── templates/ # HTML templates
+├── base.html
+├── home.html
+├── login.html
+└── register.html
+
+text
+
+## 🚀 Quick Start
+
+### 1. Create Project Structure
+
+```bash
+cd Desktop
+mkdir flask_app
+cd flask_app
+
+# Create all project files at once
+cat > app.py << 'PYEOF'
+from flask import Flask, render_template, request, redirect, url_for, session, flash
+import database
+import users
+
+app = Flask(__name__)
+app.secret_key = 'your-secret-key-change-this-in-production'
+
+database.init_db()
+
+@app.route('/')
+def home():
+ return render_template('home.html')
+
+@app.route('/register', methods=['GET', 'POST'])
+def register():
+ if request.method == 'POST':
+ username = request.form['username']
+ email = request.form['email']
+ password = request.form['password']
+
+ success, message = users.register_user(username, email, password)
+
+ if success:
+ flash('Registration successful! Please login.', 'success')
+ return redirect(url_for('login'))
+ else:
+ flash(message, 'error')
+
+ return render_template('register.html')
+
+@app.route('/login', methods=['GET', 'POST'])
+def login():
+ if request.method == 'POST':
+ username = request.form['username']
+ password = request.form['password']
+
+ success, result = users.login_user(username, password)
+
+ if success:
+ session['user_id'] = result['id']
+ session['username'] = result['username']
+ flash('Login successful!', 'success')
+ return redirect(url_for('home'))
+ else:
+ flash(result, 'error')
+
+ return render_template('login.html')
+
+@app.route('/logout')
+def logout():
+ session.clear()
+ flash('You have been logged out.', 'success')
+ return redirect(url_for('home'))
+
+if __name__ == '__main__':
+ app.run(debug=True)
+PYEOF
+
+cat > database.py << 'DBEOF'
+import sqlite3
+
+def init_db():
+ conn = sqlite3.connect('users.db')
+ cursor = conn.cursor()
+
+ cursor.execute('''
+ CREATE TABLE IF NOT EXISTS users (
+ id INTEGER PRIMARY KEY AUTOINCREMENT,
+ username TEXT UNIQUE NOT NULL,
+ email TEXT UNIQUE NOT NULL,
+ password TEXT NOT NULL,
+ created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+ )
+ ''')
+
+ conn.commit()
+ conn.close()
+
+def get_db_connection():
+ conn = sqlite3.connect('users.db')
+ conn.row_factory = sqlite3.Row
+ return conn
+DBEOF
+
+cat > users.py << 'UEOF'
+from werkzeug.security import generate_password_hash, check_password_hash
+import database
+
+def register_user(username, email, password):
+ hashed_password = generate_password_hash(password, method='sha256')
+
+ try:
+ conn = database.get_db_connection()
+ conn.execute('INSERT INTO users (username, email, password) VALUES (?, ?, ?)',
+ (username, email, hashed_password))
+ conn.commit()
+ conn.close()
+ return True, None
+ except sqlite3.IntegrityError as e:
+ return False, 'Username or email already exists!'
+
+def login_user(username, password):
+ conn = database.get_db_connection()
+ user = conn.execute('SELECT * FROM users WHERE username = ?', (username,)).fetchone()
+ conn.close()
+
+ if user and check_password_hash(user['password'], password):
+ return True, user
+ else:
+ return False, 'Invalid username or password!'
+UEOF
+
+# Create templates folder
+mkdir templates
+
+cat > templates/base.html << 'HTML1EOF'
+
+
+
+
+
+ {% block title %}Flask Auth App{% endblock %}
+
+
+
+
+
+ {% with messages = get_flashed_messages(with_categories=true) %}
+ {% if messages %}
+ {% for category, message in messages %}
+ {{ message }}
+ {% endfor %}
+ {% endif %}
+ {% endwith %}
+
+ {% block content %}{% endblock %}
+
+
+HTML1EOF
+
+cat > templates/home.html << 'HTML2EOF'
+{% extends "base.html" %}
+
+{% block title %}Home{% endblock %}
+
+{% block content %}
+Welcome to Flask Auth App
+{% if session.get('user_id') %}
+ Hello, {{ session.get('username') }}!
+ You are logged in.
+ This is your dashboard.
+{% else %}
+ Please login or register.
+{% endif %}
+{% endblock %}
+HTML2EOF
+
+cat > templates/register.html << 'HTML3EOF'
+{% extends "base.html" %}
+
+{% block title %}Register{% endblock %}
+
+{% block content %}
+Register
+
+Already have an account? Login here
+{% endblock %}
+HTML3EOF
+
+cat > templates/login.html << 'HTML4EOF'
+{% extends "base.html" %}
+
+{% block title %}Login{% endblock %}
+
+{% block content %}
+Login
+
+Don't have an account? Register here
+{% endblock %}
+HTML4EOF
+2. Create Virtual Environment
+bash
+python -m venv venv
+venv\Scripts\Activate.ps1
+If you get an error:
+
+bash
+Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser
+venv\Scripts\Activate.ps1
+3. Install Dependencies
+bash
+pip install flask werkzeug flask-wtf
+pip freeze > requirements.txt
+4. Run the Application
+bash
+python app.py
+Visit: http://127.0.0.1:5000
+
+📋 File Purpose
+File Purpose Contains
+app.py Main Flask application Routes, request handling, session management
+database.py Database operations Connection functions, table creation, SQL queries
+users.py User authentication Register, login, password hashing functions
+templates/ HTML templates Base template and page-specific templates
+requirements.txt Dependencies List of Python packages needed
+users.db Database file SQLite database with user data
+🔒 Security Notes
+This is a learning example, not production-ready
+
+Passwords are hashed using Werkzeug
+
+Never store plain text passwords
+
+Use stronger secret keys in production
+
+🚀 Next Steps
+Add password reset functionality
+
+Implement email verification
+
+Add user profile pages
+
+Create a simple blog system
+
+Deploy to Heroku or Render
+
+📚 Resources
+Flask Documentation
+
+SQLite Documentation
+
+Jinja2 Template Documentation