Python language server support

[Patrick_Wu]

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Please fill also the fields below. Note that root -b -q will tell you this info, and starting from 6.28/06 upwards, you can call .forum bug from the ROOT prompt to pre-populate a topic.

ROOT Version: 6.28/10
Platform: CentOS 7
Compiler: linuxx8664gcc

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Hi all,

Nowadays, popular code editors usually offer something called language server protocol (LSP). The features of LSP include jumping to definition and displaying inline code diagnostics etc. I have set up pyright as my python LSP, and I always get unknown member errors for ROOT module, below is one example:

I’m not able to jump to the definition of EnableImplicitMT(), but I can jump to the definition of ROOT package, so the LSP does recognize the top level ROOT.

I understand ROOT’s python interface is built upon cppyy. Perhaps this is why all the ROOT member functions are “opaque” to LSP, as they are really just C++ classes. In this sense, there may not be a solution from ROOT side at all, and it has to be fixed at LSP or cppyy level. Nonetheless, I still hope to find any workaround from the forum, so any suggestions will be really appreciated!

[Danilo]

Hi Patrick,

Thanks for the interesting post.
As you say, entities in the ROOT module are bound lazily and dynamically through cppyy and I am not surprised tools like pyright do not work out of the box. I think we do not have a solution to support that at the moment, but don’t hesitate to reach out if you have a breakthrough!

Cheers,
Danilo

[Patrick_Wu]

Definitely!