[Python-ideas] __before__ and __after__ attributes for functions

[Suresh V.]

On Friday 24 January 2014 12:01 AM, David Mertz wrote:
> On Thu, Jan 23, 2014 at 10:17 AM, Chris Angelico
> <rosuav at gmail.com
> <mailto:rosuav at gmail.com>> wrote:
>
>     On Fri, Jan 24, 2014 at 5:14 AM, David Mertz
>     <mertz at gnosis.cx
>     <mailto:mertz at gnosis.cx>> wrote:
>      > from library import foo
>      > @prepostcall
>      > def foo(*args, **kws):
>      >     return foo(*args, **kws)
>
>     That's going to infinite-loop, so you'd need to do an 'as' import:
>
>     from library import foo as foo_original
>     @prepostcall
>     def foo(*args, **kws):
>          return foo_original(*args, **kws)
>
>     Of course, this assumes you want to do a 'from' import in the first
>     place, rather than the more common approach of referencing
>     'library.foo()' - if the latter, then it is monkeypatching you need.
>
>
> All true.  For some reason I was thinking of the timing of the binding
> wrongly re. the infinite-loop. But yes, obviously using a different name
> in an 'as' import solves that.

Also it would mean that the client code imports from this package.
I would like client code to remain exactly as it is (continue to import 
from its original package) but the behavior is enhanced once this 
package is imported on startup.