[Python-ideas] descriptors outside of classes

Michael Foord fuzzyman at gmail.com
Wed Mar 30 19:42:40 CEST 2011

On 30 March 2011 17:07, Eric Snow <ericsnowcurrently at gmail.com> wrote:

> Yeah, I figured as much.  I am sure there is some convoluted way to make it
> work, but it would not nearly be worth it for what we would get out of it.

Well, it's still a *nice idea* even if it's impractical. For example to
allow for deprecation warnings on module variables Twisted creates a
subclass of modules (I believe), so that accessing the variable raises the
appropriate warning.

In the standard library we are unable to apply deprecation warnings to
module variables because we don't have a mechanism like this.

All the best,


> -eric
> On Tue, Mar 29, 2011 at 10:07 PM, Nick Coghlan <ncoghlan at gmail.com> wrote:
>> On Wed, Mar 30, 2011 at 3:59 AM, Eric Snow <ericsnowcurrently at gmail.com>
>> wrote:
>> > Here's another outlandish idea.  How about if descriptors could be used
>> > outside of classes.  I.e. any global or local variable could be assigned
>> a
>> > descriptor object and the descriptor protocol would be respected for
>> that
>> > variable.  This would be a pretty messy change, and I have no illusions
>> that
>> > the idea will go anywhere.  However, would there be room for this in
>> python?
>> Not really, because globals() both promises to return a normal
>> dictionary and to respect changes to the module globals made via that
>> dictionary.
>> All bets are off with locals(), but the globals() aspect already
>> spikes the idea, as it does many other ideas to do with speeding or
>> otherwise enhancing namespace lookups.
>> Cheers,
>> Nick.
>> --
>> Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
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