[Pyparsing] Combining strings

[<pyp...@mg...>]

Hi,

I'm trying to get a string back in one piece and the Combine class
doesn't seem to be working.  I'm not sure how to fix it.  Can anyone help?

Here's the output:
 echo /home/%(user)/apps/%(prog)/bin/%prog
['echo', '/home/', 'mgmiller', '/apps/', 'foo', '/bin/', 'foo']

I'd like to get the path back as one string ... how can I do that? 

Thanks if you can help,
-Mike

----------------------

#!/bin/env python
from pyparsing import *
import string, os
namespace = { 'a': 5, 'user':'mgmiller', 'prog':'foo' }

cmdstring =  r''' echo /home/%(user)/path/%(prog)/bin/%prog '''


def getpyvar(s, loc, match):
    'return a python type variable from our own namespace'
    if namespace.has_key(match[0]):  return namespace[match[0]]


# define grammar
keyword     = oneOf('alias dir echo ver')
args        = Word(alphanums + '_-=/"\'')
variable    = alphas + '_'

# expansions
pyvar       = Combine( Optional(printables) + Literal('%').suppress() + Optional('(').suppress()
                + Word(variable) + Optional(')').suppress() + Optional(printables) )
pyvar.setParseAction(getpyvar)


statement = (
    keyword + ZeroOrMore(pyvar | args)
    )

print cmdstring
print statement.parseString(cmdstring)

----------------------

-Mike


 -------------------------------------------------------------
 Mike Miller                  Earth, Sol, Orion Arm, Milky Way