Overwriting property-> can't set attribute

[norseman]

Gregor Horvath wrote:
> Hi,
> 
> why is this code failing?
> 
> class B(object):
>     pass
> 
> B.testattr = property(lambda s:"hallo")
> b = B()
> b.testattr = "test"
> 
> 
> Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52)
> 
> /tmp/python-14202ViU.py in <module>()
>      14 B.testattr = property(lambda s:"hallo")
>      15 b = B()
> ---> 16 b.testattr = "test"
>      17
>      18
> 
> <type 'exceptions.AttributeError'>: can't set attribute
> 
> -- 
> Greg
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 
====================================

b = B()       # synonyms
When B.testattr = "hallo"  so does b.testattr
So if in subsequent code:
B.testattr = property(lambda s:"test")
Then:
b.testattr  yields "test"
unless b was essentially destroyed/reused in between times


this is how/why things like:
gc = damn-lot-of-typing-due-to-long-names
gc.something
works as if it was:
damn-lot-of-typing-due-to-long-names.something


Steve
norseman at hughes.net