using terminal commands results in variable does not work in PYTHON
I am trying to read the brightness parameter of blue Led of omega2 to use it in a variable to use this to manage a led in my frontplate of my box with omega 2lte. I do not know what i do wrong. here is the essential part of the python script I use:
w = os.system("cat /sys/class/leds/omega2lte:blue:wifi/brightness")
if w == 255:
status2 = "connected"
status = gpioObj.setValue(0)
The frontplate shows if I am connected to my application via mobile ( iot ) or via wifi, if there is no good radio connection to mobile iot
If I look in logread I see that the cat command shows the correct value of 255 and but the ïf in the programm does not see the variable.
Van some body help me with this?
Looks like os.system() is not passing the result of cmd to w.
cmd = "cat /sys/class/leds/input3::numlock/brightness"
ret = subprocess.check_output(cmd, shell = True).strip()
if ret == b'1':
victoriano last edited by victoriano
Why don't you just read the (pseudo) file? No need to open new processes. Using
w = int(open('/sys/class/leds/omega2lte:blue:wifi/brightness').read())
Will give you what you need from python in a pythonic way.