CODEWITHSUNDEEP
pythonperlsubprocess
Le Thanh Viet
Le Thanh Viet

Reputation: 47

Process a perl script within a python script

I'm trying to execute a perl script within another python script. My code is as below:

command = "/path/to/perl/script/" + "script.pl"
input = "< " + "/path/to/file1/" + sys.argv[1] + " >"
output = "/path/to/file2/" + sys.argv[1]

subprocess.Popen(["perl", command, "/path/to/file1/", input, output])

When execute the python script, it returned:

No info key.

All path leading to the perl script as well as files are correct.

My perl script is executed with command:

perl script.pl /path/to/file1/ < input > output

Any advice on this is much appreciate.

Upvotes: 0

Views: 1019

Answers (1)

jfs
jfs

Reputation: 414865

The analog of the shell command:

#!/usr/bin/env python
from subprocess import check_call

check_call("perl script.pl /path/to/file1/ < input > output", shell=True)

is:

#!/usr/bin/env python
from subprocess import check_call

with open('input', 'rb', 0) as input_file, \
     open('output', 'wb', 0) as output_file:
    check_call(["perl", "script.pl", "/path/to/file1/"],
               stdin=input_file, stdout=output_file)

To avoid the verbose code, you could use plumbum to emulate a shell pipeline:

#!/usr/bin/env python
from plumbum.cmd import perl $ pip install plumbum

((perl["script.pl", "/path/to/file1"] < "input") > "output")()

Note: Only the code example with shell=True runs the shell. The 2nd and 3rd examples do not use shell.

Upvotes: 2

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