Object: run a .sh file at startup to start a python program using PyQt.
Method: Edit ~/.config/lxsession/LXDE-pi/autostart
Add line @~/TWB3/RunTWB.sh
Problem: err,um, doesn't work.
I've tried: commenting out the xscreensaver line with a #
Putting the line at different points in the file.

Typing ~/TWB3/RunTWB.sh at the command line works.

OS: Jessie with Pixel on a Pi3.
This is all the more irritating because (with another forum member's
help) I managed to autorun a similar program under Wheezy on an earlier
model of Pi.
Suggestions welcomed!