import subprocess, sys

perl = "C:\\Perl64\\bin\\perl.exe" 
perl_script "C:\\vub_work\\py_learn\\hello.pl"

pl_script = subprocess.Popen([perl, perl_script], stdout=sys.stdout) 
pl_script.communicate() 

##</code><code>##

 File "<ipython-input-5-d6c6696cc648>", line 4
    perl_script "C:\\vub_work\\py_learn\\hello.pl"
                ^ 
SyntaxError: invalid syntax