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

[cathal c. <cof...@gm...>]

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