Re: [Pyparsing] tokens.has_key('abc') throws exception

[Paul M. <pt...@au...>]

No tokens is not a dict, it is a ParseResults, but I want it to look very
much like a dict. Still, has_key() is a deprecated call on dict, and the
preferred form is:

if 'new_field_name' in tokens:

ParseResults will support this method.

In general, has_key() should be discarded now, in favor of "in".

-- Paul



-----Original Message-----
From: cathal coffey [mailto:cof...@gm...] 
Sent: Saturday, July 02, 2011 5:19 PM
To: pyp...@li...
Subject: [Pyparsing] tokens.has_key('abc') throws exception

Hey Guys,

I am using setResultsName like this setResultsName('new_field_name') then
inside my parse action I want to do something like the below.

if tokens.has_key('new_field_name'):
    #Do something
else:
    #Do something else

However this causes an exception to be thrown. I guess tokens is not a dict
even tho it appears to function like one.
My not so elegant solution to avoid this problem is the below.

try:
    new_field_name = tokens['new_field_name']
    #Do something
except:
    #Do something else

I don't like this try -> except approach, does anyone have a more elegant
solution?

Kind regards,
Cathal