Please post the code you have tried with subprocess. Using subprocess, you can use the commands from the py file.

thanks for the reply, I call to the function from a 'server action' and that works because I put it a logger message, and then in the function I do this:

return subprocess.call(["/usr/bin/php", "location_of_the_file/prueba.php"])

My Php is the version 2.7, so I must use:
import commands
commands.getstatusoutput('sudo -S php /route_directory/script_name.php')
this return the error code too if you need it. If you don't want it:
commands.getoutput('sudo -S php /route_directory/script_name.php') is enough
and add sudo permissions in sudoers file:
odoo ALL=(ALL) NOPASSWD:ALL
www-data ALL=(ALL) NOPASSWD:ALL