Re: is it possible to add a property to an instance?

2009-02-20 Thread Alan Isaac 

Darren Dale wrote to GHUM:

Sorry, that's an attribute, not a property.



This is a question about terminology.
In contrast to Darren's recommended usage,
I have run into the following.

If hasattr(x,'a') is True, for instance object `x`,
then `a` is an attribute of `x`.
Attributes are data attributes or callable attributes.
Data attributes are variables or properties.
Callable attributes are usually method attributes.

This seemed about right to me, but a better
(or official) taxonomy would be welcome.

Thanks,
Alan Isaac
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Re: is it possible to add a property to an instance?

2008-07-22 Thread GHUM 
 Does anyone know if it is possible to add a property to an instance at
 runtime? I didn't see anything about it in the standard library's new
 module, google hasn't turned up much either.

yes. You need nothing special, just add it:

class fish(object):
pass

a=fish()
a.legs=4
print a.legs

(or print (a.legs) on Python 3.0 and above)

so you add a property to an instance and proove that Darwin was right
in one go.

Harald
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Re: is it possible to add a property to an instance?

2008-07-22 Thread Darren Dale 
GHUM wrote:

 Does anyone know if it is possible to add a property to an instance at
 runtime? I didn't see anything about it in the standard library's new
 module, google hasn't turned up much either.
 
 yes. You need nothing special, just add it:
 
 class fish(object):
 pass
 
 a=fish()
 a.legs=4
 print a.legs

Sorry, that's an attribute, not a property.

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