Re: How to read and post tracebacks (was Registry Key Value Help)

Discussion in 'Python' started by Chris Angelico, Jan 3, 2014.

  1. On Fri, Jan 3, 2014 at 4:16 PM, Rustom Mody <> wrote:
    > Something like this is what I had in mind

    Hrm, site's having trouble. First time I tried it, it came back with a
    gateway timeout. Seemed to work second time, though, so now I have the
    content up.

    That sort of thing is fine when you're working with a very specific
    framework. (Look at point 6, for instance. Knowing the boundary
    between "code we trust because it's really thoroughly tested" and
    "code that might be the cause of the bug" means knowing what the
    framework is, usually.) If you understand the code enough to pinpoint
    the problem, you probably know enough to fix the problem, and if you
    don't, you can save yourself a lot of analysis by just posting the
    whole traceback for someone else to read. So while that advice may be
    helpful on that site's forum, for the general field of python-list
    it's probably more useful to just tell people to quote the whole
    traceback, and then we can figure things out.

    That's the "advice for python-list" part, though. What about the
    opposite side of that - helping people to understand their own code?
    Well, it's what I said in the parens about knowing the boundary. This
    is completely language-independent now; I had the same thing come up
    in REXX, the same thing will happen if you're debugging something in
    gdb, and it happens to me all the time in Pike. In all four languages
    it's common for the actual exception (or signal, in the case of gdb)
    to emanate from somewhere below user code. So there are two options:
    Either get so familiar with the library code that you recognize where
    to stop reading, or get so familiar with the code you're debugging
    that you recognize where to start reading. The first one is great for
    users-helping-users forums, the second is superb for your own code :)
    And if you can't do either of those, a crystal ball helps alot;
    chances are an expert can go to the right area even without knowing
    the code, just by what "looks right" and what "looks wrong". A handy


    PS. I left a typo in there because I'd love to see a drawing of a
    crystal ball helping Alot.
    Chris Angelico, Jan 3, 2014
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    Re: Registry Key Value Help

    Chris Angelico, Jan 3, 2014, in forum: Python
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