run python script on startup - debian

Question

I have created an application using webcam. here my application opens a window to display the image. I want to run that application on startup. if i put startup file in rc.local, it runs successfully at startup but not allowing to show window. it shows -

gtk warning cannot open display.

how to show window? please help me guys!!

Answer 1

If you're running LXDE (default on raspbian)

Add a .desktop file to your ~/.config/autostart directory (create one if not available) with 3 lines saying :

[Desktop Entry] 
Type=Application
Exec=python /path/to/your/application.py arguments

UPDATE: updated with Don Question's remark