A package import question

[Gabriel Genellina]

En Fri, 13 Jun 2008 22:38:24 -0300, Dan Yamins <dyamins at gmail.com> escribió:

>> Gabriel, thanks.  I understood about the fact that import only loads the
> first time, but didn't realize that "del" only removes the bound reference
> to the object, not as I had hoped the thing from the namespace itself.
>
> Also, I did _try_ to use reload.  however, that failed since .archive was no
> longer an attribute associated with Operations:
>
>  >>> import Operations.archive
>  >>> del Operations.archive
>  >>> reload(Operations.archive)
>  Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
>  AttributeError: 'module' object has no attribute 'archive'

I don't get *why* do you want to remove the 'archive' attribute before reloading the module. Just reload it *without* using `del` previously.

> It seems unfortunately that the "del" operation on the one hand doesn't
> really remove the .archive from memory but just it's bound name, but
> nonetheless prevents me from reloading the object kept in memory.
>
> I guess I'm trying to find a clean way to remove all the attributes
> associated with a module when I reload it.   Is there any way to do this?
> (The operation of recursively searching through the attributes of the module
> and deleting those first seems to be bad since when I did that and then try
> to _reload_ the module, the attributes I deleted are _not_ reloaded.)

When you reload a module, new definitions for existing names replace the old objects; new names are added; old names without a new value keep the previous value. (That is, objects are *replaced* and *added* but not *removed*). Isn't it enough? Or do you actually want to be sure that old names, now unused, are no longer available?


-- 
Gabriel Genellina