I want to get the stdout
in a variable after running the os.system
call.
Lets take this line as an example:
batcmd="dir"
result = os.system(batcmd)
result
will contain the error code (stderr
0
under Windows or 1
under some linux for the above example).
How can I get the stdout
for the above command without using redirection in the executed command?
If all you need is the stdout
output, then take a look at subprocess.check_output()
:
import subprocess
batcmd="dir"
result = subprocess.check_output(batcmd, shell=True)
Because you were using os.system()
, you'd have to set shell=True
to get the same behaviour. You do want to heed the security concerns about passing untrusted arguments to your shell.
If you need to capture stderr
as well, simply add stderr=subprocess.STDOUT
to the call:
result = subprocess.check_output([batcmd], stderr=subprocess.STDOUT)
to redirect the error output to the default output stream.
If you know that the output is text, add text=True
to decode the returned bytes value with the platform default encoding; use encoding="..."
instead if that codec is not correct for the data you receive.