[PyQt] hide system cursor in system wide

[iMath]

I want to hide system cursor for 10s for some reason ,but I found 


cursor.setShape(Qt.BlankCursor)


can only hide mouse cursor that is associated with QWidgets ,not in system wide ,i.e. when mouse cursor is hovering on QWidgets, it is invisible ,otherwise it is visible ,so is there any way to hide system cursor in system wide?
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