Failing to catch a specific error

Question

I wrote this simple code:

#!/usr/bin/python2.7 -tt import subprocess def main() try: process = subprocess.check_output(['unvalidcommand'],shell=True) except CalledProcessError: print 'there is the calledProcessError' if __name__ == '__main__': main()

Expected output: there is the calledProcessError

What I got: NameError: global name 'CalledProcessError' is not defined

Should be subprocess.CalledProcessError.

bereal
– bereal

2014-07-31 12:28:33 +00:00
Commented Jul 31, 2014 at 12:28 — bereal
– bereal, Commented Jul 31, 2014 at 12:28

Padraic Cunningham · Accepted Answer · 2014-07-31 12:28:28Z

def main(): try: process = subprocess.check_output(['unvalidcommand'],shell=True) except subprocess.CalledProcessError: # need to use subprocess.CalledProcessError print 'there is the calledProcessError' main() there is the calledProcessError /bin/sh: 1: unvalidcommand: not found

Or just import what you need from subprocess:

from subprocess import check_output,CalledProcessError def main(): try: process = check_output(['unvalidcommand'],shell=True) except CalledProcessError: print 'there is the calledProcessError' main()

falsetru · Accepted Answer · 2014-07-31 12:28:33Z

subprocess.CalledProcessError is not a builtin exception. You need to qualify the exception name to use it.

except subprocess.CalledProcessError: ^^^^^^^^^^^

or you need to import it explicitly:

from subprocess import CalledProcessError

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