Please Help Me About OS Library

[enes]

Hi guys! I'm using python on raspberry pi 4. I'm stucked on this code:


import os

cmd = " vcgencmd measure_temp | egrep -o '[0-9]*\.[0-9]*' "
cputemp = os.system(cmd)



(vcgencmd means the temperature of CPU)

I want to make a code like that:

if cputemp > 50:
print("hot")

[bowlofred]

First you need to capture the result.  That will be easier with subprocess. Try instead

import subprocess
cmd = "vcgencmd measure_temp | egrep -o '[0-9]*\.[0-9]*'"
result = subprocess.run(cmd, stdout=subprocess.PIPE, shell=True)
ans = int(result.stdout.rstrip()) # or float if it should be a float?

Also, if you're expecting the output to be a number, it has to be converted from the stdout string to the number (presumably either an int() or a float())

[enes]

First you need to capture the result.  That will be easier with subprocess. Try instead

import subprocess
cmd = "vcgencmd measure_temp | egrep -o '[0-9]*\.[0-9]*'"
result = subprocess.run(cmd, stdout=subprocess.PIPE, shell=True)
ans = int(result.stdout.rstrip()) # or float if it should be a float?

Also, if you're expecting the output to be a number, it has to be converted from the stdout string to the number (presumably either an int() or a float())

man thank you sooooo much.

can you explain the code if you have time?

[bowlofred]

What parts are unclear to you?

subprocess.run docs show what arguments it takes.  (Although that leads you to the Popen docs to explain shell= and stdout=).