[vtkusers] Cannot import python bindings anymore: module 'dl' has no attribute 'RTLD_NOW'

[Nicolas Cedilnik]

Hello,

Thanks for helping.

> Can you try importing the "dl" and "DLFCN" modules?  Under Python 3, 
> both should fail to load, and if they do load, then something is wrong 
> and have to find out where Python is finding them.
The first one imports but I can't figure out where from, and the second 
one doesn't import.

$ ipython
Python 3.6.2 |Continuum Analytics, Inc.| (default, Jul 20 2017, 13:51:32)
Type 'copyright', 'credits' or 'license' for more information
IPython 6.1.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: import dl

In [2]: dl.__file__
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-2-b1226f8e7c87> in <module>()
----> 1 dl.__file__

AttributeError: module 'dl' has no attribute '__file__'

In [3]: import DLFCN
---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-3-fa2771fe0f81> in <module>()
----> 1 import DLFCN

ModuleNotFoundError: No module named 'DLFCN'

I've checked if something named dl was in my variable $PYTHONPATH 
folders, but it isn't the case.

I do have a ~/dl folder though, and the problem disappears if I rename 
it or don't launch the interpreter from the ~ folder. This is weird 
because there's not ~/dl/__init__.py or ~/dl.py

I'm not sure whether this is VTK or python bug, but I've found a 
workaround: launch the interpreter from somewhere else than my homedir.

Cheers,

-- Nicolas