How to write a Python script for XSS vulnerability detection

Question

I am developing a security testing tool and want to include a Python-based method for detecting XSS (Cross-Site Scripting) vulnerabilities in web applications. While I understand that XSS occurs when user input is improperly sanitized before being reflected in the page, I am unsure how to:

• Craft an automated script to inject and detect XSS payloads.
• Use libraries like requests and BeautifulSoup to test input fields.
• Handle cases where the response might be obfuscated (e.g., JavaScript-based rendering).
  A sample Python script or a breakdown of how automated XSS detection tools work would be very helpful.