Oops, hit send by mistake...continued below. On Thu, Feb 19, 2009 at 3:40 PM, Kent Johnson <ken...@tds.net> wrote: > On Thu, Feb 19, 2009 at 2:34 PM, Isaac Eiland-Hall <daychi...@gmail.com> > wrote: >> http://python.pastebin.com/m26864a1b >> >> >> >> Traceback (most recent call last): >> >> File "./loopy", line 328, in <module> >> >> >> set[current_set][current_section][current_key] = current_value >> >> KeyError: 'DEFAULT' > >> So what I'm trying to do on line 328 is to store the current key/value pair >> in a dictionary under the proper section, which is in the proper set. Hence, >> set[setname][section][key]=value >> >> >> >> You can see my insanely-verbose log here: >> >> http://python.pastebin.com/m6dcfb96d >> >> >> >> That was from a run where I commented out line 328… (that dos the actual >> >> >> >> Googling "KeyError" seems to indicate problems while trying to *retrieve* >> values from a dictionary, whereas I'm trying to *set* values… > > Yes, KeyError happens on retrieval. Maybe you don't realize you are > doing two retrievals, then a set: > set[current_set][current_section][current_key] = current_value > means: > - retrieve the value of set[current_set] > - from the above value, retrieve the value associated with current_section > - in the above value, set the value associated with current_key. > > I haven't looked at the code, but maybe current_set or current_section > is 'DEFAULT >
is 'DEFAULT' and that value hasn't been added yet. You have to create/add the dicts at the top of the hierarchy before you can set values at the lower part. Take a look at dict.setdefault() or collections.defaultdict for some possible fixes. Kent _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
