Inheriting Python modules?

[Quinn Dunkan]

On Tue, 18 Dec 2001 17:10:19 GMT, Timo Linna
<timo.SPAM.linna at iki.ME.fi.NOT.invalid> wrote:
>Hi,
>
>How should "dynamic module inheritance" be implemented with Python?
>
>Example:
>
>It should be possible to write: "import defaults" so that it would first
>import everything from common.defaults -module and after that other stuff
>from product.defaults-module. Content of both modules should be accessible
>through one common (defaults) interface so that the caller wouldn't have to
>know from which module the code is actually accessed.
>
>I would NOT like to create "dummy" logical defaults-module which would
>simply import both modules - things should happen automatically at runtime.

Anyway, untested:

class Multi_namespace:
    def __init__(self, namespaces):
        self.namespaces = namespaces
    def __getattr__(self, attr):
        for ns in self.namespaces:
            try:
                return getattr(ns, attr)
            except AttributeError:
                pass
        raise AttributeError(attr)

m = Multi_namespace(map(__import__, (sys, os)))
print m.path
print m.access


If you like that sort of thing, you could stuff 'm' into sys.modules.



Speaking of which, here's a fun way to bind a lot of names:

class c: pass
for k, v in lot_of_names:
    setattr(c, k, v)
sys.modules['c'] = c
from c import *