removing unused import sys
removing unused import sys

drufat/vispy,ghisvail/vispy,QuLogic/vispy,bollu/vispy,bollu/vispy,QuLogic/vispy,inclement/vispy,drufat/vispy,ghisvail/vispy,Eric89GXL/vispy,ghisvail/vispy,drufat/vispy,bollu/vispy,QuLogic/vispy,inclement/vispy,michaelaye/vispy,Eric89GXL/vispy,michaelaye/vispy,michaelaye/vispy,Eric89GXL/vispy,inclement/vispy