Probably best if I skip the example and show what code I do have:
~~~~~~~~~~~
for key in h.keys():
wssd=h[key]['WSSD']
wspd=h[key]['WSPD']
wmax=h[key]['WMAX']
newi=h[key]['NEWI']
if wssd<-989. or wspd<-989. or wmax<-989.: break
if wspd==0.: break
~~~~~~~~~~~~~~~~~
Where the "newi" = "abcd" that I showed before. I have no where else in my
code anything pertaining to these 4 keys. The first 3 were there, and produce
no errors. I am making adjustments to an existing script. I only have C
programming knowledge so my thought was that it "newi" was just a variable that
needed to be assigned. You'll notice the parameters below (i.e., if wssd <
-989 ) but there is obviously nothing for "newi" at the moment. The program's
only error at the moment seems to be this line:
newi=h[key]['NEWI']
But as you can see, the other items are set up the same way.
Thanks bundles!!!
Sara
Message: 7
Date: Sun, 08 Jul 2007 02:21:25 -0400
From: Brian van den Broek
Subject: Re: [Tutor] Key Error
To: [EMAIL PROTECTED]
Cc: tutor@python.org
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Sara Johnson said unto the world upon 07/08/2007 01:34 AM:
> Sorry, this is probably too general a question, but I can't find
> any specific information on it. What exactly is a "key error" and
> how do I clear it?
>
> I entered something like this:
>
> abcd=h[key]['ABCD']
>
> and when I run it I'm getting
>
> KeyError: 'ABCD'
>
> What does this mean?
>
> Thanks!
>
Hi Sara,
It means you've tried to access a data structure (most likely a
dictionary) with a key that does not exist in that structure. Witness
>>> my_dict={42:"Six times seven", 1: "The loneliest number"}
>>> my_dict[42]
'Six times seven'
>>> my_dict['42']
Traceback (most recent call last):
File "", line 1, in
KeyError: '42'
>>> my_dict[17]
Traceback (most recent call last):
File "", line 1, in
KeyError: 17
>>>
It isn't a question of `clearing' it, but of tracking down the wrong
assumption behind your code. It may be that you thought you were using
a key you'd added before and were wrong (my_dict['42'] as opposed to
my_dict[42] shows a common source of that).
But, from your
> abcd=h[key]['ABCD']
I'm guessing that you've got the key-access syntax a bit wrong. Did
you mean
abcd = h['ABCD']
instead?
HTH,
Brian vdB
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