billingsystem.py

# Import necessary libraries for database and web framework
import sqlite3
from flask import Flask, request, render_template

# Initialize Flask application
app = Flask(__name)

# Database connection
conn = sqlite3.connect('billing_system.db')
cursor = conn.cursor()

# Routes for customer management
@app.route('/customers')
def list_customers():
    # Retrieve and display customer data
    pass

# Routes for invoice generation
@app.route('/invoices')
def generate_invoice():
    # Create and display invoices
    pass

# Routes for payment processing
@app.route('/payments')
def process_payment():
    # Process payments and update invoice statuses
    pass

# Routes for report generation
@app.route('/reports')
def generate_report():
    # Generate and display reports
    pass

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