Add persistency capability?

[Rhuax]

I think it would be extremely useful adding methods to save and load the kdtree to file.

[stefankoegl]

I have not tested it, but you should be able to pickle/unpickle kdtrees. Have you tried this already, or do you have some more specific requirements?

[Rhuax]

There are problems with lambda functions. I found a workaround: get all indexed points, save them to file. Later, create a new kdtree using points read from the file. It's obviously a bad solution.

By the way, handling lambda functions should solve the problem.

https://stackoverflow.com/questions/25348532/can-python-pickle-lambda-functions

[Rhuax]

@stefankoegl Did you check it?

[Rhuax]

Problem solved using dill package, which can handle lambda functions. It would be still useful having a wrapper inside the kdtree class. I close the issue