Newbie Alert: subprocess.call

[Carbon]

I am new to Python and am trying to write a GUI wrapper script in python 
2.5 to get username and passwords from Linux users to send as options to 
run an app on a 2X terminal server. I came across the easygui module and 
its multpasswordbox function, which made popping a dialog box and storing 
the usernames very painless. 

However, subprocess.call as implemented below doesn't work. For some 
reason the "-s ts.mycompany.org:80" parameter is being interpreted 
differently by the application when sent from the python script than it 
does when sent from the BASH script below. The :80 is the default port so 
it isn't technically required, but the script doesn't work without it 
either.

Any ideas where I should look? Is subprocess.call the best way to do what 
I want? Any advice would be most appreciated.


Here's the broken bit:

print "Reply was:", fieldValues
print "Reply was:", fieldValues[0], fieldValues[1]

subprocess.call(["/opt/2X/Client/bin/appserverclient", "-u fieldValues
[0]", "-p fieldValues[1]", "-s ts.mycompany.org:80", "-d corp", "-S 
local", "-c 16", "-e 0xF", "-l 0x0409", "-a #1"])


Output:

me at work:~/bin$ ./demo2.py 
Reply was: ['MyUsername', 'MyPassword']
Reply was: MyUsername MyPassword

ERROR in CTcpConnector:  ts.mycompany.org: unable to resolve host
Error 7: TCP/IP connection: unable to resolve host.


This BASH script runs correctly:
me at work:~/bin$ cat 2xconnect
#!/bin/bash

USER=$1
PASS=$2

/opt/2X/Client/bin/appserverclient \
-u "$USER" \
-p "$PASS" \
-s ts.mycompany.org:80 \
-d corp \
-S local \
-c 16 \
-e 0xF \
-l 0x0409 \
-m 2G \
-a "#1"