[Python-Dev] PEP: Post import hooks

[Phillip J. Eby]

At 01:47 AM 1/11/2008 +0100, Christian Heimes wrote:
>Phillip J. Eby wrote:
> > At 11:45 PM 1/10/2008 +0100, Christian Heimes wrote:
> >> In my version a hook is immediately called when the the registry value
> >> is set to None. When a hook is registered for a module during the
> >> execution of the callback then the hook is fired directly and not after
> >> the existing hooks are called. Is this a problem for you?
> >
> > Yes, because it violates the invariant that hooks for a given module
> > are called in the same order that they were registered in.
>
>Please check the changes and the new unit test in r59902 (
>http://svn.python.org/view?rev=59902&view=rev ). Are you satisfied with
>the ordering or do you think I should queue the hooks for already loaded
>modules?

As I said above, calling the callbacks immediately is a problem, 
because it leads to significantly less predictability (and therefore 
control) of callback order.