Expose build information to Python

[felixhekhorn]

How about adding something like PyO3/maturin#100 ? or as is written there https://github.com/PyO3/pyo3-built/

this would facilitate the debugging process ...

[alecandido]

pyo3-built looks unnecessarily complex and too unmaintained.

I'd suggest to go for the first option, it looks perfect to me :)

[cschwan]

That's a good idea, I'll look into it!

[cschwan]

I tried adding

m.add("__version__", env!("CARGO_PKG_VERSION"))?;

in src/lib.rs, but this doesn't have an effect. It should add a variable pineappl.__version__, shouldn't it?

[felixhekhorn]

yes - you can check the available attributes with dir (in case it got bound somewhere else ...)

[felixhekhorn]

@cschwan the magic was just in the nesting of the layers (it got bound in pineappl.pineappl) - I reexposed it again on top level

[felixhekhorn]

@scarlehoff this is what would have helped us in hunting NNPDF/nnpdf#1529 (comment)

[cschwan]

@felixhekhorn cheers!