This is great, thanks!

As this version reads from a file, I guess one don't have to import html2text?

And to read the path to the file I want to test I added:

test_file = sys.argv[1]

and changed the 'with open' line to

with open(test_file, 'r') as content_file:

That way its quick and easy to just run python read.py /path/to/testfile.txt to check a file.

Quick, easy and fun way to check readability before publishing. Who knows, maybe it will improve my writing?