parallel subprocess.getoutput

Fri May 11 08:04:10 EDT 2012

Hello,
I wrote the following code for using egrep on many large files:
MY_DIR = '/my/path/to/dir'
FILES = os.listdir(MY_DIR)
def grep(regex):
 i = 0
 l = len(FILES)
 output = []
 while i < l:
 command = "egrep " + '"' + regex + '" ' + MY_DIR + '/' +
FILES[i]
 result = subprocess.getoutput(command)
 if result:
 output.append(result)
 i += 1
 return output
Yet, I don't think that the files are searched in parallel. Am I
right? How can I search them in parallel?
Jaroslav