[vtk-developers] Question regarding Python imports.

[Elvis Stansvik]

2017-12-20 7:45 GMT+01:00 Andrew Maclean <andrew.amaclean at gmail.com>:
> What do people using Python mostly do/prefer?
> 1) import vtk
> 2) from vtk.xx import yy
> 3) from vtk import yy

I generally use 3, but 1 for quick one-off scripts (for the convenience).

I dislike 1 because of the resulting repetitive "vtk.vtk...." (e.g.
vtk.vtkPolyDataMapper). I prefer 3 because explicitly importing the
symbols I use somehow feels more cleanly (no real motivation for that
though).

I've never used 2.

>
> In 2) we are actually specifying the module where yy resides.
>
> In PyCharm:
> For the case of 1)  when we declare something like z = vtk.yy we get a
> cannot find reference in __init__.py() warning
> For case of 2) or 3) we get an unresolved reference for yy in the from
> statement.

It was some time since I used PyCharm for VTK stuff, but I seem to
remember these problems.

Would be great if what you guys come up with could work well in
PyCharm of course, since it's my goto IDE when writing non-trivial
things (for small stuff I use Vim).

Elvis

>
> I'm trying to speed up vtk in Windows!
>
> Regards
>    Andrew
>
> --
> ___________________________________________
> Andrew J. P. Maclean
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