I am using python 2.7, therefore I do not know why gstreamer tries to load 
certain modules it shouldn't be supposed to.
I have solved both of them and now I can learn gstreamer and python on my win 
box following tutorial sitesGetting started with GStreamer with Python

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| Getting started with GStreamer with PythonYou know, there are tonnes of 
undocumented things out there. Really, really cool technologies that should be 
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http://brettviren.github.io/pygst-tutorial-org/pygst-tutorial.pdf

TO SOLVE: Remove 
msys2\mingw64\lib\gstreamer-1.0\libgstpythonplugin-cpython-35m.dllIt has to be 
removed to make gst-launch-1.0.exe work and allows even python 2.7 
gobject/gstreamer imports to work properly

Another issue is:
msys2\mingw64\lib\gstreamer-1.0\libgstwebp.dll
gst-launch-1.0:17652): GStreamer-WARNING **: Failed to load plugin 
'W:\SDKs\msys2\mingw64\lib\gstreamer-1.0\libgstwebp.dll': 
'W:\SDKs\msys2\mingw64\lib\gstreamer-1.0\libgstwebp.dll': The specified module 
could not be found.
ERROR: pipeline could not be constructed: empty pipeline not allowed.
TO SOLVE: Manually removing libgstwebp.dll makes gst-launch-1.0 work correctly 
so far$ gst-launch-1.0.exeERROR: pipeline could not be constructed: empty 
pipeline not allowed.
I do not know what/how to solve when using python 3.x or actually needing the 
webp plugin.
Posted these to help another one, it took me a week to understand/solve.
I saw that other gobject distributions such as pygiaio 
https://sourceforge.net/projects/pygobjectwin32/files/?source=navbar suffer 
from the same issues
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