从 python 运行 perl 脚本

Question

I know there are some topic on Stack Overflow about this. But none of these make any sense to me. I am new to both python and perl and trying my best to understand. I would like to run a perl script from a piece of python code.

executing the perl script in command prompt goes as following:

perl perlscript.pl input.bopt7 output.xml

I would like to run this command from my python code. I have tried the following:

pipe = subprocess.Popen(["perlscript.pl" , "input.bopt7" , "output.xml"], stdout=subprocess.PIPE)

but this does not work. I get an error saying it is not a valid win32 ...

I need no input or output from this script. Just need to run it once.

Answer 1

You need to include the perl command itself when executing a perl script:

pipe = subprocess.Popen(["perl", "perlscript.pl" , "input.bopt7" , "output.xml"], stdout=subprocess.PIPE)

You did the same thing on the command line prompt; the Popen class cannot guess from the perlscript.pl file that you wanted to run this script with Perl. :-)

Answer 2

Did you try to add perl to Popen arguments (just as you do on the command line)?

pipe = subprocess.Popen(["perl", "perlscript.pl" , "input.bopt7" , "output.xml"], stdout=subprocess.PIPE)

In your example, Windows tries to execute "perlscript.pl" as a Win32 executable, since this is the first parameter you specified, and fails because it doesn't contain the proper binary header (since it is a text file).

Answer 3

The first argument should be perl.exe , if perl.exe is in your PATH ; or the full path to the executable as all the rest are arguments to perl.exe .

Also make sure you put the full path for perlscript.pl and input.bopt7 .