That's not quite right.
When you do
module = __import__('pkg.mod')
the left-most package/module will be assigned to <module> (in this case 'pkg'),
and it will have the attribute mod. This means that members of mod aren't
directly accessible from <module>. So in order to access a member of mod, you
would still have to specify module.mod.func() (instead of the module.func()
that you might expect).
However, if you specify a non-empty fromlist, the full package will be assigned
to module, so when you do
module = __import__('pkg.mod', fromlist=['func'])
pkg.mod gets assigned to <module> and you can now call module.func()
This is a great explanation of it:
http://stackoverflow.com/questions/2724260/why-does-pythons-import-require-fromlist/2725668#2725668
On Tuesday, May 21, 2013 2:59:47 AM UTC-7, Cuchullain wrote:
> No worries - I hope I got that right.
>
>
>
> It's a super useful pattern, because if you allow users to supply
> the import-strings, you don't have to care where the module is
> deployed. It's up to the user to make sure it's accessible via the
> PYTHONPATH, or what have you.
>
>
>
> So - folks can update their code and add new behaviours without
> effort on your part.
>
>
>
> D
>
>
>
>
>
> On 21/05/13 21:48, Todd Widup wrote:
>
>
>
>
> thanks Donal, nice way of doing it :D
>
>
>
>
>
>
> On Tue, May 21, 2013 at 10:43 AM, Donal
> McMullan <[email protected]>
> wrote:
>
>
>
>
>
>
>
> if True:
>
> module_name_variable = "usermodules.todd"
>
> else:
>
> module_name_variable = "usermodules.jane"
>
>
>
> module = __import__(module_name_variable)
>
> instance = module.Klass()
>
> result = instance.prebuild()
>
>
>
> # Should have the same effect as:
>
> import usermodules.todd
>
> instance = usermodules.todd.Klass()
>
> result = instance.prebuild()
>
>
>
>
>
> I think you're correct to be wary of calling Python's
> eval:
>
> http://docs.python.org/2/library/functions.html#eval
>
>
>
>
>
>
>
>
>
>
>
> On 21/05/13 20:54, Todd Widup wrote:
>
>
>
>
>
>
>
>
>
>
>
>
> is there a python equivalent to eval?
>
>
>
> I am setting up a few things that could allow
> the user to specify a pre-build function but
> user A could specify a different prebuild
> function than user B, and I need some way of
> handling this.
>
>
>
> only thing I can think of right now is using
> maya.mel.eval("python string")
>
> which I really don't like the idea of doing
> that.
>
>
>
> any other ideas?
>
>
>
>
>
> --
>
> Todd Widup
>
> Creature TD / Technical Artist
>
> [email protected]
>
> [email protected]
>
> www.toddwidup.com
>
>
>
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> --
>
> Todd Widup
>
> Creature TD / Technical Artist
>
> [email protected]
>
> [email protected]
>
> www.toddwidup.com
>
> --
>
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> --
>
> Donal McMullan
> Production Engineer
> Desk: x6411
> Direct: +64 4380 3810
> Mobile: +64 2166 1254
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