Get a return value using subprocess

Question

I want to be able to define a variable by the return value of a script. This is what I currently have:

sum_total_earnings_usd = subprocess.call([SCRIPT, "-d", date])

I have checked the return value of SCRIPT, however, when I try and set this variable, it always returns 0 ( http://docs.python.org/library/subprocess.html#subprocess.call ). How would I run this script and capture the return value to store as a variable?

Answer 1

使用subprocess.check_output()而不是subprocess.call() 。

Answer 2

If your script is returning the value, then you would want to use subprocess.check_output() :

subprocess.check_output([SCRIPT, "-d", date], shell=True).

subprocess.check_call() gets the final return value from the script, and 0 generally means "the script completed successfully".

Answer 3

subprocess.call already returns the process return value. If you're always getting 0 , then you'll need to review SCRIPT to make sure that it's returning the value you expect.

To double check, you can also execute the SCRIPT in a shell and use $? to get the return code.