[Python-ideas] Add "goto fail" to Python?

[David Mertz]

This is *exactly* what Python does right now!

class ToFailError(Exception): pass

try:
    do_some_stuff()
    if (some_error):
        raise ToFailError
    do_other_stuff()
    try:
       thing_that_might_fail()
    except SomeOtherError:
       handle_it()

except ToFailError:
    here_we_are()


On Wed, Mar 5, 2014 at 7:54 PM, Sturla Molden <sturla.molden at gmail.com>wrote:

> "goto fail" is a well-known error handling mechanism in open source
> software, widely reputed for its robusteness:
>
> http://opensource.apple.com/source/Security/Security-
> 55471/libsecurity_ssl/lib/sslKeyExchange.c
>
> https://www.gitorious.org/gnutls/gnutls/source/
> 6aa26f78150ccbdf0aec1878a41c17c41d358a3b:lib/x509/verify.c
>
> I believe Python needs to add support for this superior paradigm.
>
> It would involve a new keyword "fail" and some means of goto'ing to it. I
> suggest "raise to fail":
>
> if (some_error):
>    raise to fail
>
> fail:
>    <error handling code>
>
> Unless there are many objections, this fantastic idea might be submitted
> in a (short) PEP somewhere around the beginning of next month.
>
> There is some obvious overlap with the rejected "goto PEP" (PEP 3163) and
> the Python 2.3 goto module. However, the superiority of goto fail as error
> generation and error handling paradigm has since then been thoroughly
> proven.
>
> http://legacy.python.org/dev/peps/pep-3136/
> http://entrian.com/goto/download.html
>
>
> Regards,
> Sturla Molden
>
>
>
>
>
>
>
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