Problems receiving arguments on a subprocess

[hidura at gmail.com]

Hello i am trying to make a subprocess that will have to send data as an  
arguments and is executing the script but don't receiving anything.

Here is the code of the subprocess:
car = Popen(shlex.split(self.block.getAttribute('cmd')),  
stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
data =  
car.communicate(str("<request>"+self.extract.getByAttr(self.block, 'name', 'args')[0].toxml()+"</request>").encode())



dataOut = data[0].decode()
log = data[1].decode()
print(dataOut)

if car.returncode < 1:
return dataOut.split('\n')

else:
print(log)
return log

Here is the code of the script:

"""
Created By: hidura
On Date: Jan 25, 2011
"""
from xml.dom.minidom import parseString
import os
import sys

class savCSS:
"""This class has to save
the changes on the css file.
"""

def __init__(self, args):

document = parseString(args)
request = document.firstChild

address = request.getElementsByTagName('element')[0]
newdata = request.getElementsByTagName('element')[1]

cssfl = open("/webapps/karinapp/Suite/"+address.getAttribute('value'), 'r')
cssData = cssfl.read()
cssfl.close()

dataCSS = ''
for child in newdata.childNodes:
if child.nodeType == 3:
dataCSS += child.nodeValue

nwcssDict = {}

for piece in dataCSS.split('}'):
nwcssDict[piece.split('{')[0]] = piece.split('{')[1]


cssDict = {}

for piece in cssData.split('}'):
cssDict[piece.split('{')[0]] = piece.split('{')[1]


for key in nwcssDict:
if key in cssDict == True:
del cssDict[key]

cssDict[key] = nwcssDict[key]


result = ''
for key in cssDict:
result += key+"{"+cssDict[key]+"}"


cssfl = open(cssfl.name, 'a')
cssfl.write(result)
cssfl.close()



if __name__ == "__main__":

print(sys.stdin.read())
savCSS(sys.stdin.read())


Thanks in advance
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