How to use myOwnMagField with Python

[atmosalex]

I appreciate the Python wrapper which makes IRBEM easy to integrate with other projects. I would like to perform IRBEM calculations using my own magnetic field class (including finding Lstar) and would appreciate some guidance:

I see that I can instantiate an IRBEM magnetic field Python object like so:
mf_MAG = ib.MagFields(options=[1, 0, 0, 0, 4], verbose=False, kext='None', sysaxes=6, alpha=[90])
With options[4] set to some other value, I can query the field using mf_MAG.get_field_multi(XYZ, maginput), for example. When I set it to 4 as above, I get fill values from the dummy subroutine in myOwnMagField.f.

The magnetic field I want to use is currently implemented as a high level Python object, with a method analogous to myOwnMagField. Q1) how would I use my Python method to perform IRBEM calculations instead of rewriting myOwnMagField.f? Q2) are there limitations when calling make_lstar and specifying myOwnMagField?

[mshumko]

Perhaps @AntoineBrunet, or someone more familiar with this routine can chime in on this, but here are my 2 cents.

It appears that myOwnMagField can only be implemented in Fortran. So one way to get around this is to write myOwnMagField to call your model implemented in python. This can be done with the python C API, which I've asked copilot to explain (see its response to my last question).

No guarantees that this will work as is, but this may be worth a shot! Let me know if I can be of more help

[AntoineBrunet]

I believe you are right. It could probably be done this way. I have no experience with calling python functions from C (wrapping it in Fortran should then be easy enough), though. It would probably introduce some constraints on the magnetic field model function (for instance being independent from the python code calling the irbem library).
If you get it to work, even partially, we would definitely be interested to hear about it.

[atmosalex]

OK thank you for the responses! I will take your suggestions and try to implement something