Question Python libraries for Buhlmann

[LFMarm]

Hi, has anyone found reliable libraries to calculate deco schedules? I plan dives with Subsurface but it doesn’t seem to have APIs to call from Python.
I would like to be able to calculate simple schedules, GF99, SurfGF.

Many thanks.

 

[attack33]

Hi, has anyone found reliable libraries to calculate deco schedules? I plan dives with Subsurface but it doesn’t seem to have APIs to call from Python.
I would like to be able to calculate simple schedules, GF99, SurfGF.

Many thanks.

I went looking around for this a long time ago after a question was posed by some friends after a dive to Hendley's Castle "what deco penalty would have occurred if I would have stayed 5 more minutes?". After some thorough research, I landed on this repo called 'DecoTengu', which is an implementation in python (and some Rust I believe) of Buhlmann ZH-L16-GF. I believe it was a translation from Erik Baker's repo in Fortran, but not 100% sure (it was before my time). I remember I was able to answer my question through writing a function that declared gases and then looped through calculating a bunch of dives by increasing time and depth and grabbing total deco time. I got close to an answer and didn't really venture further. I found a fork of it on Github. The original source doesn't appear to be hosted there any longer. Wish I had more to provide here. Let us know what you find out!

 

[crofrog]

You could probably grab deco.c from subsurface and use cpython to wrap it or just refactor it into python.

 

[Mobulai]

IIRC libbuhlmann/src at master · AquaBSD/libbuhlmann (which is in C) has a few python wrappers for tests that can be adopted for usage

 

[mr_v]

ChatGPT

 

[Mobulai]

ChatGPT

Did you work through all these indents manually?

Edit: Oh I see something glitched out

 

[mr_v]

Did you work through all these indents manually?

Edit: Oh I see something glitched out

Yeah, SB doesn't like the code. If you know Python, working out those indents will take less than 3 mins.

 

[Mobulai]

Yeah, SB doesn't like the code. If you know Python, working out those indents will take less than 3 mins.

I remember a similar inline quote bug from when I used slack — I always preferred code blocks; but I digress

 

[dmaziuk]

... 'DecoTengu' ...

I found DecoTengu to be way too "pythonic" for normal people so I put together a few dicts and functions. Look for "DIY ZHL" on github and feel free to reuse what you like.

I was playing with notebooks at the time so the actual deco stuff was not my main focus, that's my excuse for never taking it anywhere.