Can't copy simulation in Python, wonder how to fix

[JonathanHammer2]

Hello again,

I am trying to copy a "master" simulation in Python into a new, independent, "copy" simulation so that I can make changes to the states independent of the "master" without affecting it.

I tried copy and also "deepcopy" per the following:

    sim_copy = copy.copy(sim)

and I get an error about "pickling," per below. I'm wondering if you have a straightforward solution to this.

Update: I see the self copy as in : sim_copy = sim.copy()

Will this allow me to manipulate sim_copy without affecting "sim?"

Thanks

Thanks!

Traceback (most recent call last): File "/Applications/PyCharm.app/Contents/plugins/python/helpers/pydev/pydevd.py", line 1496, in _exec pydev_imports.execfile(file, globals, locals) # execute the script File "/Applications/PyCharm.app/Contents/plugins/python/helpers/pydev/_pydev_imps/_pydev_execfile.py", line 18, in execfile exec(compile(contents+"\n", file, 'exec'), glob, loc) File "/Users/cycloastro/PycharmProjects/Kalman Python Project/main.py", line 268, in main() File "/Users/cycloastro/PycharmProjects/Kalman Python Project/main.py", line 128, in main sim_copy = copy.copy(sim) File "/Users/cycloastro/anaconda3/envs/pythonProject1/lib/python3.10/copy.py", line 92, in copy rv = reductor(4) ValueError: ctypes objects containing pointers cannot be pickled

[hannorein]

Both

sim_copy = copy.copy(sim)

and

sim_copy = sim.copy()

works for me. To look into it, I'd need to know which version of python and rebound you're using. I'd also need to have some code that I can run to reproduces the issue..

[JonathanHammer2]

Well, sim.copy() seems to work. I will just use that until I hit the next obstacle!

Thanks, happy new year.

Jonathan Hammer Research Scientist [page1image55562928]

From: Hanno Rein @.> Date: Wednesday, December 27, 2023 at 12:37 PM To: hannorein/rebound @.> Cc: Jonathan Hammer @.>, Author @.> Subject: Re: [hannorein/rebound] Can't copy simulation in Python, wonder how to fix (Issue #736)

Both

sim_copy = copy.copy(sim)

and

sim_copy = sim.copy()

works for me. To look into it, I'd need to know which version of python and rebound you're using. I'd also need to have some code that I can run to reproduces the issue..

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