Problem using Optional pyparsing

[Nathan Harmston]

Hi,

I know this isnt the pyparsing list, but it doesnt seem like there is
one. I m trying to use pyparsing to parse a file however I cant get
the Optional keyword to work. My file generally looks like this:

ALIGNMENT  1020  YS2-10a02.q1k chr09     1295       42    141045
142297   C    1254 95.06 1295 reject_bad_break 0

or this:

ALIGNMENT  36    YS2-10a08.q1k chrm      208      165     10745
10788   C      44 95.45 593 reject_low 10,14

and my grammar work well for these lines, however somethings the row looks like:
ALIGNMENT  53    YS2-10b03.p1k chr12      180      125   1067465
1067520   C      56 98.21 532|5,2 reject_low 25

So I try to parse the 532 using

from pyparsing import *

integer = Word( nums )
float = Word( nums+".")
identifier = Word( alphanums+"-_." )

alignment = Literal("ALIGNMENT ").suppress()
row_1 = integer.setResultsName("row_1")#.setParseAction(make_int)
src_id = identifier.setResultsName("src_id")
dest_id = identifier.setResultsName("dest_id")
src_start = integer.setResultsName("src_start")#.setParseAction(make_int)
src_stop = integer.setResultsName("src_stop")#.setParseAction(make_int)
dest_start = integer.setResultsName("dest_start")#.setParseAction(make_int)
dest_stop = integer.setResultsName("dest_stop")#.setParseAction(make_int)
row_8 = oneOf("F C").setResultsName("row_8")
length = integer.setResultsName("length")#.setParseAction(make_int)
percent_id = float.setResultsName("percent_id")#.setParseAction(make_float)
row_11 = integer + Optional(Literal("|") + commaSeparatedList )
)#.setResultsName("row_11")#.setParseAction(make_int)
result = Word(alphas+"_").setResultsName("result")
row_13 = commaSeparatedList.setResultsName("row_13")

def make_alilines_status_parser():
    return alignment + row_1 + src_id + dest_id + src_start + src_stop
+ dest_start + dest_stop + row_8 + length + percent_id + row_11 +
result + row_13

def parse_alilines_status(ifile):
    alilines = make_alilines_status_parser()
    for l in ifile:
        yield alilines.parseString( l )

However my parser always fails on lines of type 3. Does anyone know
why the Optional part is not working.

Many Thanks in advance

Nathan