[Python-ideas] of properties and metaclasses

[Josiah Carlson]

Greg Ewing <greg.ewing at canterbury.ac.nz> wrote:
> 
> Josiah Carlson wrote:
> > I would really like
> > to see a *sane* use-case for the potential feature
> 
> I would like to have some reasonable way of achieving
> the effect of a __getattr__ for a module, so that I
> could implement auto-loaded classes.
> 
> You can do this now, but the convolutions required are
> horrible to behold.
> 
> I don't think this particular proposal is the way
> to go about it, though.

It's already possible.

    >>> import sys
    >>> class foo(object):
    ...     def __getattr__(self, clsname):
    ...         return type(clsname, (object,), {})
    ...
    >>> sys.modules['loader'] = foo()
    >>> from loader import bar
    >>> bar
    <class '__main__.bar'>
    >>> import loader
    >>> loader.boo
    <class '__main__.boo'>
    >>>


 - Josiah