Filter that converts HTML to something XML compliant (closing tags++)

convert_to_valid_xml.py

#!/usr/bin/env python3

'''
  NOTE: This script requires beautifulsoup4 to be installed.

  Use this script as a filter to convert HTML to XML compliant markup. Useful when pasting raw HTML where XML is expected.
  Combine with tools like clipcopy to make for a nice copy-and-paste utility, for example:
  
  ./convert_to_valid_xml.py < index.html | clipcopy
'''

import sys
from bs4 import BeautifulSoup

soup = BeautifulSoup(sys.stdin, 'html.parser')

print(soup.prettify(formatter='xml'))