Debugging difficulty in python with __getattr__, decorated properties and AttributeError.

[Steven D'Aprano]

On Fri, 03 May 2013 13:52:23 +0600, Mr. Joe wrote:

> Thanks for clearing up. Developers of python should address this issue,
> in my opinion. 3.4/3.5 maybe, but better late than never.
> 
> Recently, I've been beaten back for using some exotic features of
> python. 

What do you consider "exotic"? Neither properties nor __getattr__ are 
exotic, although of course like all features of a language they have 
their own quirks.


> One is this[ Took me hours to get to the bottom ].

Well, of course hindsight is 20:20, and I don't know how complicated your 
actual code is, but "hours" seems a bit poor. I could believe half an 
hour. Maybe an hour. But of course everything is easy to the guy who 
doesn't have to do it.


> The other one
> is 'property' decorator. I was using it extensively until I needed to
> make a child class. Then I came to know that 'property' does not play
> well with polymorphic code. :( 

I don't understand what you are trying to say. Properties can be as 
polymorphic as any other Python function.


> I resorted to some lambda hacks learned
> from stackoverflow.com to solve the problem. 

That's not a good sign. Any sentence containing "hacks" and 
"stackoverflow" is a warning that you're probably doing something wrong.



-- 
Steven