How to return encoded value using subprocess.Popen in Python?

Question

Can someone tell me how to encode the return statement so that it can decode it. Or whats needs to be changed to get encoded value.

Code

def run_process(cmd_args):
    with subprocess.Popen(cmd_args, stdout=subprocess.PIPE, stderr=subprocess.PIPE) as proc:
        return proc.communicate()


res = run_process(cmd_args);
print(res)
print(res.decode("utf-8"))

Output

print(res.decode("utf-8"))
AttributeError: 'tuple' object has no attribute 'decode'

blhsing · Accepted Answer · 2018-07-18 12:24:16Z

1

Popen.communicate returns a tuple of (stdout, stderr), so you need to treat the returning value as such:

stdout, stderr = run_process(cmd_args);
print(stdout)
print(stdout.decode("utf-8"))

Please read Popen.communicate's documentation for more details.

answered Jul 18, 2018 at 12:24

blhsing

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1 Comment

PRONAY PRAMANIK Over a year ago

Got it ! @blhsing , Thank you so much stdout, stderr = run_process(cmd_args); this helped me.

ashish chauhan · Accepted Answer · 2021-05-24 14:09:22Z

0

instead of return proc.communicate(),return proc.communicate()[0]. As proc.communicate() is a list of output and error and it seems u only need output part

answered May 24, 2021 at 14:09

ashish chauhan

1

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