Error in Plex 1.1.4.1

[srijit@yahoo.com]

Hello,
I got the following error while using Plex 1.1.4.1

D:\Python24\myf iles>python plex1.py
Traceback (most recent call last):
File "plex1.py", line 1, in ?
from Plex import *
File "D:\python24\li b\site-packages\Plex\_ _init__.py", line 34, in ?
from Lexicons import Lexicon, State
File "D:\python24\li b\site-packages\Plex\L exicons.py", line 12, in ?
import DFA
File "D:\python24\li b\site-packages\Plex\D FA.py", line 9, in ?
import Machines
File "D:\python24\li b\site-packages\Plex\M achines.py", line 14, in ?
from Transitions import TransitionMap
File "D:\python24\li b\site-packages\Plex\T ransitions.py", line 85
def get_epsilon(sel f,
SyntaxError: Invalid syntax. Assignment to None.

The corresponding source code :

#file plex1.py

from Plex import *

lexicon = Lexicon([
(Str("Python"), "my_favourite_l anguage"),
(Str("Perl"), "the_other_lang uage"),
(Str("rocks"), "is_excellent") ,
(Str("sucks"), "is_differently _good"),
(Rep1(Any(" \t\n")), IGNORE)
])

filename = "plex1.txt"
f = open(filename, "r")
scanner = Scanner(lexicon , f, filename)
while 1:
token = scanner.read()
print token
if token[0] is None:
break

The error was removed when I used the following code in Transitions.py

def get_epsilon(sel f,
none = None):
"""
Return the mapping for epsilon, or None.
"""
return self.special.ge t('', None)


Regards,
Srijit