GeezerVison

Hi,

Nick Coghlan <ncoghlan <at> gmail.com> writes:

> One of the tasks where classic classes are currently far superior to 
> new-style classes is in writing proxy classes like weakref.proxy - cases 
> where nearly all operations need to be delegated to some other object, 
> with only a few being handled via the proxy type object itself.
Yes.  I stumbled upon that multiple times when writing proxies for thread
locals.  The solution I came up with is rather ugly but works at least:

http://dev.pocoo.org/projects/werkzeug/browser/werkzeug/local.py#L202

The main problem with such proxies is that especially builtin types perform
various type checks which break proxies sooner or later anyways (currently even
abstract base classes implementing a compatible interface).  So as soon as you
start doing something like some_list + proxy_to_list you get a TypeError.

Regards,
Armin