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Hello, 
I have libsylvain.so which has just one function (sylvain_display()) which displays an hello world windows through QT libraries.
I have this one program `sylvain' which is a single line program which calls sylvain_display from libsylvain.so.
When I run `sylvain', I have some debug output from QT on the console, and the hello world window is displayed on my TV (I am running this on a Raspberry Pi with FreeBSD).
Now, when I run python2.7 or python3.6, and load libsylvain.so either through the ctypes module or through a C extension module, and call the sylvain_display() function from python, I have the console log output from QT as with the `sylvain' program, but I don't have the window on my TV!
I guess the rendering to the TV is done on a separate thread and this one is not called or locked?
I came up with this simple test program to isolate the issue because both PyQT and PySide now don't work as expected, I have console log but no actual TV output.
This used to work one year ago, I don't know what has changed in Python. 
Hope you guys will figure this out.
libsylvain.cpp: http://dev.sylvaingarrigues.com/libsylvain.cpp
sylvain.cpp (test program for libsylvain): http://dev.sylvaingarrigues.com/sylvain.cpp 
sylvain-ctypes.py (load libsylvain): http://dev.sylvaingarrigues.com/sylvain-ctypes.py
Also tried with a C extension to rule out ctypes bug, same issue:
sylvainmodule.cpp (python module wrapper): http://dev.sylvaingarrigues.com/sylvainmodule.cpp
sylvain-next.pu (load sylvainmodule and sylvain_display): http://dev.sylvaingarrigues.com/sylvain-cext.py
build script: http://dev.sylvaingarrigues.com/build.sh 

I'm closing this as out of date because the links no longer work and both Python 2.7/3.6 are no longer maintained. If you are still having this problem with more recent versions of Python, please create a new issue with up-to-date reproduction information.