[Pyparsing] Problem with grammar

[Andy E. <and...@pa...>]

Hi all - 
  I'm a first-timer here, and am having a problem with my parser.  
  I'm trying to write a parser that follows the following rules - 
 
  proc_statement = "proc" + procname + Optional(data_statement) + semicolon + 
run_statement 
  proc_name = "print" or "summary" or "tabulate"
  data_statement = "data" + "=" + dataset_name + semicolon
  run_statement = "run" + semicolon

 I am getting this error, and I have no idea why - 
 Traceback (most recent call last):
  File "minisas.py", line 28, in ?
    procName  = MatchFirst( delimitedList( "print", "tabulate", "summary", 
delim="," ) )
TypeError: delimitedList() got multiple values for keyword argument 'delim'

  The following examples would all be legal, according to the grammar 
  ( Note - the "run" does not have to be on the same line as the proc 
statement )
*** Start of examples ***
  proc print; run; 
  
  proc print data=fred; run;

  proc summary; run; 
  
  proc summary data=mydata2; run;

  proc tabulate; run;
*** End of examples ***

Here is what I have so far - 
*** Start of code ***

# minisas.py
#
# simple demo of a SAS-like language
#
from pyparsing import * 

def test( str ):
    print str,"->"
    try:
        tokens = sasgrammar.parseString( str )
        print "tokens = ",        tokens
    except ParseException, err:
        print " "*err.loc + "^\n" + err.msg
        print err
    print


# Define tokens
sasprog = Forward()
procName = Forward()
semi = Forward()
dataStmt = Forward()
runStmt = Forward()
ident = Forward()
procToken = CaselessLiteral( "proc" ) + procName + Optional(dataStmt) + semi
procName  = MatchFirst( delimitedList( "print", "tabulate", "summary", 
delim="," ) ) 
dataStmt = CaselessLiteral( "data" ) + "=" + ident
ident    = Word( alphas, alphanums )
runStmt  = CaselessLiteral( "run" ) + semi
semi = ";"

# Define the grammar
sasgrammar  <<  sasprog 

# Test the grammar
test( "proc print ; run ; " )
test( "proc print data = fred ; run ; " )
test( "proc contents ; run ; " )
test( "proc contents data = mydata2 ; run ; " )
test( "proc tabulate; " )
test( "proc tabulate data = foo3; run ; " )

*** End of code *** 

 So, any help is very much appreciated, as I am totally lost ... :-) 
 Many thanks in advance - 
 - Andy