executing perl script from python

Question

I`m trying to executo Perl script from python script, but it seems like it has not been executed! using this command in python:

os.popen('dump_hash.pl {}'.format(scn_filepath))

this is the dump_hash.pl script:

$path = <STDIN>;
require "$path";
open (OUTFILE, "+>dumpered_hash");
print OUTFILE Dumper("\%...");
close (OUTFILE);

and the script stucks when trying to open 'dumpered_hash' as readable file. and when I run ls command in shell, the directory doesn`t have dumpered_hash file.

thanks you.

how can the script "not been executed" and yet "stucks when trying to open"? If it is a problem with opening the file for output, maybe these links will help you: perldoc.perl.org/File/Path.html#ERROR-HANDLING stackoverflow.com/questions/3233327/… - otherwise, can you provide more detailed information? What works, what not, how was which script called, etc. Also paste exact error messages — x29a
– x29a, Commented Sep 9, 2013 at 15:30
What about using subprocess.call('perl dump_hash.pl') using the subprocess python module? — wflynny
– wflynny, Commented Sep 9, 2013 at 16:00
subprocess.Popen('dump_hash.pl {}'.format(scn_filepath)), tried subprocess.call it didn`t work, gives the same error. — user2234234
– user2234234, Commented Sep 9, 2013 at 16:41
If you're running under *nix, you may want to add a #! line to the beginning of the .pl file otherwise your OS has little reason to guess it's Perl. — tjd
– tjd, Commented Sep 9, 2013 at 16:56

amon · Accepted Answer · 2013-09-09 15:30:47Z

3

Your Perl script is wrong:

You read the path from STDIN, not from the command line arguments.
You do not remove the newline after reading a line. You would be looking for "foo\n" instead of "foo".
You have no error checking whatsoever.
You do not load the Data::Dumper module.

And are you sure that you really want to execute the file at $path as Perl code?

Cleaned up, I'd write the Perl script as

perl -MData::Dumper \
  -do $ARGV[0];' \
  -e'print Dumper \%some_global' \
  input-file.pl >output

Or as

use strict; use warnings;
use Data::Dumper
do $ARGV[0];
open my $fh, ">", "output" or die "Can't open output: $!";
print { $fh } Dumper \%some_global;

If you really want the filename from STDIN:

 use strict; use warnings;
 use Data::Dumper;
 chomp(my $path = <STDIN>);
 do $path;
 ...

answered Sep 9, 2013 at 15:30

amon

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3 Comments

user2234234 Over a year ago

the path is for a file that contains complex hash table name /../hash.pl . i have loaded the dumper and i have warnings. i need to require the the file in the path.

amon Over a year ago

require and do are equivalent for this purpose.

user2234234 Over a year ago

still, it not running. the script doesnt creat any files. and if create files for it, it doesnt write anything to them. BTW, the script was checked with require to the file with full path. and it worked.

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