Re: [Pyparsing] CSVs with trailing comma

[Paul M. <pa...@al...>]

Nathan,

Not sure what you mean by "unfortunately doesnt work."  I tried your example
pretty much verbatim, and I got this:

>>> from pyparsing import *
>>> data = "a,b,"
>>> foo = delimitedList(Word(alphanums))
>>> (foo+stringEnd).parseString(data)
Traceback (most recent call last):
<snip>
pyparsing.ParseException: Expected stringEnd (at char 3), (line:1, col:4)
>>> (foo+Optional(",").suppress() + stringEnd).parseString(data)
(['a', 'b'], {})

There is also the pyparsing built-in, commaSeparatedList:

>>> commaSeparatedList.parseString(data)
(['a', 'b', ''], {})

Note that it treats the trailing comma as a delimiter with a blank item at
the end.

-- Paul
 

-----Original Message-----
From: pyp...@li...
[mailto:pyp...@li...] On Behalf Of Nathan
Harmston
Sent: Monday, September 03, 2007 4:47 PM
To: pyp...@li...
Subject: [Pyparsing] CSVs with trailing comma

Hi,

If I have a comma-separated list
        a,b,        # notice the trailing comma
     how can I specify a grammar to ignore the trailing comma.....
      foo = delimitedList( Word(alphanums, delim=",")

        The only I could think off was foo + Optional(",").suppress(), which
unfortunately doesnt work. Is there a way to this in pyparsing?

Many Thanks in advance,

Nathan

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