Making My Own Black Mirror Bandersnatch Easter Egg2019-01-24
The TV program Black Mirror released an interactive choose-your-own-adventure film on Netflix called Bandersnatch over the holiday period. I enjoyed playing through it and finding the various endings, especially since I recently played The Stanley Parable which is in the same genre but with more humour. Bandersnatch has many endings and easter eggs, so naturally there’s a whole subreddit dedicated to tracking them down. The most impressive is an embedded Spectrum tape noise containing a QR code that leads to a real ZX Spectrum game made in 2018 by developer Matt Wescott.
Netflix are running an extensive advertising campaign for Bandersnatch across London, with several different adverts all featuring pseudocode. I’ve spotted them on billboards, buses, and even on the stairs of hipster central station Shoreditch High Street:
The code looks like Python, although it won’t actually run as it’s not valid syntax. However, this got me looking at the packages it seems to import.
bandersnatch is a tool by the Python Packaging
Authority, for running a mirror of the Python Package Index (PyPI).
The name is not based on the Black Mirror episode, the package pre-dates it.
Instead, both take the name from Lewis Carroll’s fictional monster,
featured in Through the Looking Glass.
None of the other names featured in the adverts -
commuter, etc. - seem to exist as open source
packages on PyPI.
blackmirror, which I just created as my own unofficial easter
If you now run
pip install blackmirror, you’ll get a command
blackmirror, which has one sub-command
bandersnatch. Running this presents you with a timed choice screen that imitates those in the interactive film:
Depending on your choice, a different web page will open.
I wrote it in a few hours using a bunch of neat tools.
The CLI command parsing is done with
argparse from Python’s standard
library. Although alternatives exist like
docopt, I’ve always found
argparse pretty easy to
The rendering on screen is down with
curses, which is quite a thin
wrapper around the
curses C library.
I hadn’t had a chance to use it before so this was an educational exercise.
It’s nice that it’s built-in and complete, but it’s not really “Pythonic” as the function names are still typically
obscure abbreviated C names, such as
stdscr.getch (standard screen/whole window, get character).
I wrote the minimum of disposable code here, but if I were doing anything more complicated, like a full
curses beneath a comprehensible higher level API would be my first priority.
Lastly, in order to get the image of the Bandersnatch from Netflix into a terminal-renderable format, I I extracted it from the marketing material with GIMP:
…and then used a short node script using the
This is an excellent library and it has a bunch of options to make it really easy to convert an image to the ASCII art you want.
Overall, this was an enjoyable and educational way to spend a morning. Code is on GitHub if you want to take a look, however I don’t expect to work on it any further. Enjoy!
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