Note on windows: - if you virtualenv python3, make sure to copy following data over to your newly created virtualenv: * copy Python3.dll in main python directory -> virtualenv/Scripts - needed for Qt5, so gui based things. not needed if you use the library only. - a dll called Python3x.dll should already exist there. * tcl directories need to be copied over for some libraries using it - (this project currently does not need that)