"cimported module has no attribute" when compiling with Cython 3.0

[oliche]

Hello,

I was trying a fresh installation of datoviz and couldn't compile using ./manage.sh cython

Here is an excerpt of the otherwise very long and repetitive error message

Error compiling Cython file:
------------------------------------------------------------
...
    elif dt == cv.DVZ_EVENT_MOUSE_WHEEL:
        x = c_ev.u.w.pos[0]
        y = c_ev.u.w.pos[1]
        dx = c_ev.u.w.dir[0]
        dy = c_ev.u.w.dir[1]
        modifiers = _get_modifiers(c_ev.u.w.modifiers)
                                       ^
------------------------------------------------------------

datoviz/pydatoviz.pyx:517:39: Cannot select attribute of incomplete type 'DvzEvent'

Error compiling Cython file:
------------------------------------------------------------
...


# TODO: add more keys
_KEYS = {
    cv.DVZ_KEY_LEFT: 'left',
    cv.DVZ_KEY_RIGHT: 'right',
      ^
------------------------------------------------------------

datoviz/pydatoviz.pyx:55:6: cimported module has no attribute 'DVZ_KEY_RIGHT'

This was fixed by downgrading cython to 0.29.36 in this manner:
pip install Cython==0.29.36

If this is reproducible on other machines and not a weird configuration on my end, I suggest pinning the cython version until the build recipe is compatible with Cython 3 +

[rossant]

Thank you for the report @oliche ! Pinning seems like a good idea since this branch is not going to last long now.