Successfully compile mtsgui on Windows with Python 3

[gaotongsh]

Before this commit, SCons could not detect Qt if Python 3 is used. After the 2to3 conversion of the two files, Qt can be detected and mtsgui can compile. But it cannot run and shows this error:

This is because qwindows.dll is missing. In order to run mtsgui, I had to manully copy qwindows.dll of Qt 5.9.1 and place it at dist/platforms/qwindwos.dll. In order to fix this issue, more changes are probably needed to the building scripts. More comments are welcome on this issue.

[banbao990]

When I followed your steps, I met the error like this, I get confused. Haved you met the problems like this?