python os.popen, os.system, subprocess.popen, subprocess.call

[siavashr]

Hi,

I am new to python, and I am trying to do the following from my python code:

echo 1 > /sys/devices/omapdss/display0/enabled

I have tried to do this with the following functions:

os.popen('echo 0 > "/sys/devices/omapdss/display0/enabled"')

os.system('echo 0 > "/sys/devices/omapdss/display0/enabled"')

subprocess.call('echo 0 > /sys/devices/omapdss/display0/enabled', shell=True)


subprocess.popen('echo 0 > /sys/devices/omapdss/display0/enabled', shell=True)

All of the above functions work in python command prompt, but from my script os.system and os.popen do not do anything and subprocess.pope n and subprocess.call give: [Errno 12] Cannot allocate memory
My code runs on Angstrum Linux

Any input is appreciated.

Cheers,
Siavash