[Python-Dev] package imports, sys.path and os.chdir()
tismer at stackless.com
Fri Apr 27 23:21:25 CEST 2012
On 27.04.12 22:00, Brett Cannon wrote:
> On Fri, Apr 27, 2012 at 10:39, Christian Tismer <tismer at stackless.com
> <mailto:tismer at stackless.com>> wrote:
> On 27.04.12 02:39, Nick Coghlan wrote:
> On Fri, Apr 27, 2012 at 7:30 AM, Christian
> Tismer<tismer at stackless.com <mailto:tismer at stackless.com>> wrote:
> No big deal and easy to work around, I just would like to
> understand why.
> I don't like it either and want to change it, but I'm also not
> to mess with it until the importlib bootstrapping is fully
> and stable.
> For the moment, there's a workaround in runpy to ensure at least
> __main__.__file__ is always absolute (even when using the -m
> Longer term, I'd like to see __file__ and __path__ entries to be
> guaranteed to be *always* absolutely, even when they're imported
> relative to the current working directory.
> Is there a recommendable way to fix this? I would like to tell people
> what to do to make imports reliable. Either I put something into
> the toplevel __init__ code, or I hack something into .pth or
> and then forget about this.
> No, there isn't.
> But I fear hacking __init__ is the only safe way that works without
> a special python setup, which makes the whole reasoning rather
> useless, because I can _not_ forget about this.... waah ;-)
> Yeah, to guarantee the semantics you are after you have to grab that
> '' entry in sys.path as early as possible and substitute it with the
> cwd so that its initial value propagates through the interpreter.
> Importlib is already having to jump through some hoops to treat it as
> '.' and even that doesn't get you what you want since that will change
> when the cwd is moved.
> I'm personally in favour of changing the insertion of '' to sys.path
> to inserting the cwd when the interpreter is launched.
Thanks Brett, that sounds pretty reasonable. '' always was too implicit
cheers - chris
Christian Tismer :^)<mailto:tismer at stackless.com>
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