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The output of subprocess.check_output() looks like this at the moment:
CalledProcessError: Command '['foo', ...]' returned non-zero exit status 1
Is there a way to get a better error message?
I want to see stdout and stderr.
290
The subprocess. check_output() is used to get the output of the calling program in python. It has 5 arguments; args, stdin, stderr, shell, universal_newlines. The args argument holds the commands that are to be passed as a string.
communicate() #Another way to get output #output = subprocess. Popen(args,stdout = subprocess. PIPE). stdout ber = raw_input("search complete, display results?") print output #... and on to the selection process ...
subprocess. check_call() gets the final return value from the script, and 0 generally means "the script completed successfully".
Redirect STDERR to STDOUT.
Example from the interpreter:
>>> try:
... subprocess.check_output(['ls','-j'], stderr=subprocess.STDOUT)
... except subprocess.CalledProcessError as e:
... print('error>', e.output, '<')
...
Will throw:
error> b"ls: invalid option -- 'j'\nTry `ls --help' for more information.\n" <
Explantion
From check_output documentation:
To also capture standard error in the result, use
stderr=subprocess.STDOUT
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