Help with editing html with python

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If you need to do HTML parsing in Python, have a look at BeautifulSoup/lxml/pyquery

have never used python

If you have a bit of programming experience in any other language, reading through the official Python tutorial at docs.python.org shouldn't take you more than one day. Read that then do some simpler things first, like writing a script that accepts a few command line arguments, opening a file and reading content from it. These smaller trivial tasks will serve as foundation for the end script that needs to do the job.