alt Hacker NewsYea and this created "bank python" informally a good article is here.
https://calpaterson.com/bank-python.html
The best description about how it became a problem is one of the paragraphs.
"New starters take an exceptionally long time to get up to speed - and that's if they don't resign in fit of pique as soon as they see the special, mandatory, in-house IDE (as I nearly did). Even months in, new starters are still learning quite fundamental new things: there is a lot that is different."
I think it took me til I was there around two and a half years to fully comprehend it when I was working on it. Not much modern training til they figured out they had to teach it again that was better. The worst part is to make an UI around it coding it and it wasn't approved for new projects.
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Wow thanks for the link. My first reaction was "that's the jankiest thing I've ever heard of" but on reflection the author is correct about it being a fairly optimally fit predator. When the benchmark is .xlsx files on a shared drive things are bound to get pretty weird.
That article was fascinating, thanks for sharing it. I wonder if all banks use the same "bank Python" or if they all forked it in different ways?