[Tutor] Executing shell commands

[Phil]

Thank you for reading this.

Python3 on Linux.

I'm looking for ideas on how I might collect some .gpx files and then 
upload them to a serial device as a batch via a for-loop mechanism. 
Uploading the files one at a time is quite straight forward, no problems 
there.

I thought I might start with something like this and then collect the 
file names in a list and then upload them one by one. However, I'm 
missing a step from the listing of the file names and then collecting 
them. Plus the following fails with a directory does not exist error 
even though executing the same command "ls /home/phil/Downloads/*.gpx" 
from the command line shows that there isn't a problem.

import subprocess
subprocess.call(["ls", "/home/phil/Downloads/*.gpx"])

The above fails but the following is OK.

subprocess.call(["ls", "/home/phil/Downloads/GC1BPG4.gpx"])

Any suggestion on how I might at least make a start will be greatly 
appreciated.

-- 
Regards,
Phil