I’ve seen the film, and all fans of Python should really enjoy it. Try to carve out time to attend the live release chat!
What to expect: CultRepo (formerly Honeypot) makes niche documentaries for tech fans. They’re not looking to win movie awards, but to create content their target audience will appreciate. No hardball, staged drama, or “gotcha” ploys. Think of your favorite cultish cable “news” channel interviewing your favorite cultish celebrity 
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Guido said more in his parallel post to the Events category:
It’s a good mix. However, Python’s history now encompasses a cast of many thousands, and many notable people aren’t even mentioned. For example, Fredrik Lundh (the legendary effbot, now deceased) only shows up via his name flashing by in a brief screenshot of an email he sent to Guido in the very early days.
A great many don’t show up at all. I’d name more, but any list I presented would necessarily also miss many. Suffice it say that even half of the PythonLabs crew didn’t get any mention (although do show up in a group photo).
I do show up, but not “live”. For various reasons (mostly related to declining health), I didn’t actively participate. I gave the director (Ida Bechtle) a pile of source material at the start, and that was the last of my involvement. She spliced in some recycled video of an interview I did with the PyPy folks at a PyCon some years ago, but I’m there mostly so people could recite my so-called “Zen of Python”, which an actual historian (Joseph Dragovich) assured me is “the most famous values statement for any programming language community”.
Which I think is true. But even if you hate that, it occupies a brief part of the film, and you’ll find plenty else to like.
It’s fun! You’ll like it.