On 2011-10-07 14:21, lina wrote:
I don't know why this gives a key error on 'E' (which basically means that
there is no key 'E') since the code above should guarantee that it exists.
Odd. I'm also not sure why the error occurs after it prints summary. Are you
sure the output is in the sequence you showed in your message?
One simple explanation: it continued on to the next file, which has
neither "E" nor "B" in it.
In this directory, I only kept one file. try.xpm
That's wrong.
$ more try.xpm
aaEbb
aEEbb
EaEbb
EaEbE
$ ls
counter-vertically-v2.py try.xpm
counter-vertically.py try.txt
As "ls" proves, you have *4* files in the directory.
You start your script with "dofiles(".")". This function gets a list of
*all* files in the directory in an *arbitrary* order and processes each
of it.
In your function "processfile" you first create an empty dictionary
("results = {}") and then you put values into the dictionary *only* for
xpm-files ("if ext == INFILEEXT:"). *But* you print the summary for
*every* file because the indentation at the end of the function is
outside the if-branch where you check for the file extension. So for
every file which isn't a xpm-file, "results" is an empty dictionary (see
first line of the function) and therefore "zip(results['E'],
results['B'])" will throw an exception.
How to solve it? I personally would check for the file extension in the
function "dofiles" and would only continue with xpm-files (in other
words move the if-statement from "processfile" to "dofiles".)
Bye, Andreas
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