Python script to run a Program, HELP.

I need a .py file (script) to launch an external program from Reaper. (If this is possible with a script ?) [1] I have no/none/zero knowledge of Python/Scripting [2] eg. Say I want to launch Wavelab from a button/action from Reaper. Full path "C:\Program Files (x86)\Steinberg\WaveLab 6\WaveLab.exe". If I have a .py file to do this I can add it as an action/button [3] I can then copy this file and edit it with Notepad and replace "C:\Program Files (x86)\Steinberg\WaveLab 6\WaveLab.exe" with any other "exe File Path name", thus creating my own/more actions. [4] Problem is to get one working script to do this. Any help ? Very much please . . . please . . .

Hi, You can do this already with . Goto the main menu, then extensions > command parameters Then click on external tool 1, and browse for Wavelab Then in the actions menu, look up external tools, and you can assign that to a button.

Yes, I know about that, but that only gives you 2 actions. Thanks for the nice GIFs and your effort. I really want to use Python, more powerfull, no limit. (will give me a change to start learning scripting as well) I got this far : (After many searching/reading) import os os.system ("Notepad.exe") ... this opens Notepad along (with a black "cmd.exe" window) After much struggle this also opens Notepad (+ cmd window as well) import os os.system ("C:\\WINDOWS\\system32\\notepad.exe") Must be 2 slashes "\\" ...but this won't work import os os.system ("C:\\Program Files (x86)\\Steinberg\\WaveLab 6\\WaveLab.exe") I'm now fighting with the "call" command: import "something (can't figure this out)" call ("C:\\Program Files (x86)\\Steinberg\\WaveLab 6\\WaveLab.exe") It don't recognize the "call" command, some module has to be imported, I think...I don't even know if I am on the right track. Tried on Python v2.7.3, now running v3.2.3, still no luck. Any programmer that can help, it's probable very easy ?

os.system waits for a return value so won't work from reascript try: Code:

Many thanks for brief explanation! Im trying to start learning Python as well :) Is it possible to write a string such as "%windir%\system32\shutdown.exe -s -t 0" ? to shutdown Windows from Reaper

Wow Zerkie. Great graphical explanation. What program did you use for that? Thanks, Wyatt

Holy crap - talk about synchronicity! I just did this for the first time today as well. But I used subprocess.call(). My version briefly flashes a console window, which I don't want. Can anyone tell me if this Popen() method does or does not do that? Unfortunately I'm not near a computer I can test with. Thanks!