displaying errors when executing a python script from php with system, in a shared hosting (other output is displayed)

Question

I'm executing a python script from php with way,

$mystring = system('python test.py', $retval);

and it works, I just would like to see error messages from the python script. Is it possible? It is returning output, for example, I see a "print "hello"" from the python script, but I dont see errors from the python scripts, it's obviously failing to load a module because execution stops there and I dont see that error displayed.

Possible duplicate of Php system() / exec() don't return output and there are others. In essence, try: $mystring = system('python test.py 2>&1', $retval);instead. This mixes stderr and stdout. — Dilettant
– Dilettant, Commented Jun 16, 2016 at 12:57
Actually, it returns output, for example, if the python script has a print I see it, but I can't see errors. I see "prints" before an import error but not after, and the import error message isnt displayed — Pablo
– Pablo, Commented Jun 16, 2016 at 13:01
Yes, and that is where the 2>&1 comes into play, it tells the system to write all that is intended for file descriptor 2 (the standard error stream out) instead to fd 1 (which is standard output if no one fiddles with it ;-) ). Please try the comment/answer and if it does what you want, enjoy and report back here. Thanks. — Dilettant
– Dilettant, Commented Jun 16, 2016 at 13:04
I just tried it.. with the last option I dont see output at all :) — Pablo
– Pablo, Commented Jun 16, 2016 at 13:08
What underlying shell on that hosting platform? Can you for testing log in via ssh and try in that folder directly a python test.py 2>&1 versus a python test.py 2> /dev/null and maybe show the python code here in the question? — Dilettant
– Dilettant, Commented Jun 16, 2016 at 13:15

Hristo Eftimov · Accepted Answer · 2017-05-23 08:16:56Z

0

It's better if you use in PHP:

exec('python test.py', $outp, $return);

You will have at $return the error status returned by the python script (there is an error if is not 0), and the error text at the $outp

edited May 23, 2017 at 8:16

Hristo Eftimov

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answered May 23, 2017 at 7:36

nacho

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