MAINT: mypy imports of Cython "modules"

[tylerjereddy]

For kicks following the merge of #11678, I checked on a module I'm familiar with by disabling the ignores and I see:

scipy/spatial/_spherical_voronoi.py:17: error: Module 'scipy.spatial' has no attribute '_voronoi'  [attr-defined]
scipy/spatial/_spherical_voronoi.py:18: error: Module 'scipy.spatial' has no attribute 'cKDTree'; maybe "KDTree"?  [attr-defined]

That's because those are Cython extension objects rather than pure Python modules.

Can be suppressed in this way with a simple inline comment--would we want to do this more broadly throughout code base?

diff --git a/scipy/spatial/_spherical_voronoi.py b/scipy/spatial/_spherical_voronoi.py
index f14b894aa..f7f86e540 100644
--- a/scipy/spatial/_spherical_voronoi.py
+++ b/scipy/spatial/_spherical_voronoi.py
@@ -14,8 +14,8 @@ Spherical Voronoi Code
 import warnings
 import numpy as np
 import scipy
-from . import _voronoi
-from scipy.spatial import cKDTree
+from . import _voronoi # type: ignore
+from scipy.spatial import cKDTree # type: ignore
 
 __all__ = ['SphericalVoronoi']

[person142]

Ah-I am actually working on this right now. Currently handling by adding a bunch of

[mypy-scipy.sparse.linalg.dsolve._superlu]
ignore_missing_imports = True

to the conf file.

[person142]

PR for that soon, as I was working on it mypy found, if not a bug, at least an oddity which I'm making a preliminary PR for...

Edit: the preliminary PR is #11687.