call a perl script with options within a python

Question

I know there are other posts with same question, but I am unable to run a perl script within my python script referring those posts.

Here is the excerpt from my code:

var1 = "-proj xyz"
var2 = "-c groups"
proc2 = subprocess.Popen(["perl", "some_perl_script.pl", var1, var2], stdout=subprocess.PIPE)
proc2.stdin.write(var1)
proc2.stdin.write(var2)
proc2.stdin.close()
proc2.wait()

Note: I'm supposed to run: ./some_perl_script.pl -c groups -proj xyz

Please let me know what am I doing wrong here? Thanks!

Possible duplicate of this, although I can't be certain without more details about what your actual problem is. — GoBusto
– GoBusto, Commented Nov 13, 2014 at 21:26
Why are you sending the contents of var1 and var2 to your Popen command, and writing them to stdin? — MattDMo
– MattDMo, Commented Nov 13, 2014 at 21:26

abarnert · Accepted Answer · 2014-11-13 21:26:48Z

You're passing "-proj xyz" as a single argument, instead of two. In other words, instead of this:

./some_perl_script.pl -c groups -proj xyz

… you're doing the equivalent of this:

./some_perl_script.pl '-c groups' '-proj xyz'

So, when the perl script goes looking to see if any argument is -c, none of them are, because -c groups is not -c.

Of course in some cases you'll get away with this; most argument parsers that treat -cfoo and -c foo the same will also treat '-c foo' the same. But I'm guessing any parser that's looking for arguments like -proj isn't such a case.

So, if you really need these option/argument pairs to each be in a separate variable for some reason, try this:

var1 = ["-proj", "xyz"]
var2 = ["-c", "groups"]
proc2 = subprocess.Popen(["perl", "some_perl_script.pl"] + var1 + var2,
                         stdout=subprocess.PIPE)

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