If anyone else may need it, the code is this and it works fine. The only difference is that the script had to do an explicit commit.
def procesar():
import subprocess
import os
script = os.path.join(request.folder, 'private', 'script.py')
comando = "python %s/web2py.py -S py_ccu -M -R %s"%(os.getcwd(),
script)
subprocess.Popen(comando, shell=True)
redirect(URL(r=request, f='a_function'))
As always, excellent web2py
Jose
