Class data being zapped by method

[John Machin]

Kevin M wrote:
> Figures. I'll try to complicate it sufficiently ;)
>
>
> [edit] I was going to try to sum up what goes on, but I realized that I
> was retyping what I already programmed in an effort to better
> illustrate exactly what I'm doing. Pastebin it is. Don't fear, it's
> only around 200 lines total.
>
> Class file -- http://pastebin.4programmers.net/640

Any *good* reason you have (a) split your solution in an arbitrary
fashion [some in a class, some not] (b) put the class in a separate
file?

> Main file -- http://pastebin.4programmers.net/639
>
> PLEASE don't worry about any file parsing stuff. That's all working
> well. The problem is that I'm getting IndexError exceptions in my
> _a_count and _b_count methods when they're called from analyze(). I
> added some code to increase verbosity, and it turns that the count
> methods within the Test class are operating on EMPTY lists ( [] ), so
> naturally they can't index anything. This is the core of the problem,
> especially considering that line 98 in main.py works as expected.
>

Line 98 is #
print arrTests[2].data

This doesn't show that *all* cases have non-empty lists.
Data is appended *conditionally* around about line 92.

<aside>
The try/except adds another level of (totally unnecessary, AFAICT)
complexity & stuffupability -- you should really do it the other way
around:

    for line in arrLines:
        row = line.split()[offset:]
        for index, test in enumerate(arrTests):
            blah = row[index]
            if blah not in bad_vals:
                etc
and *don't* ignore IndexError (with this rearrangement, any IndexError
is a bug).
</aside>

To demonstrate that you have a real problem:

(1) replace line 98 by:
print [i, len(x.data), id(x) for i, x in enumerate(arrTests)]

(2) after line 26 in your class file, insert

print id(self), len(self.data)

[The id() will tell you unequivocably which test object has the problem
when/if the _a_sort method fails]

HTH,
John

P.S. Next time, show your actual output.