Re: [Configobj-develop] Can I get a value through the interpolation path?

[Michael F. <fuz...@vo...>]

On 17/03/2010 15:42, Jason Baker wrote:
> I'm not really sure how best to phrase my example, so I'll illustrate 
> it with code.  :-)
>
> Suppose I have the following config file:
>
> [section]
> foo='bar'
>     [[subsection]]
>
> Now suppose I do the following:
>
> configobj = <get configobj somehow>
> subsection = configobj['section']['subsection']
> subsection['foo']
>
> This throws a key error, which is most likely the expected behavior as 
> foo isn't a key on subsection.  However, I would like to have a way to 
> get the value of foo as if subsection were like this:
>
> [[subsection]]
> foo = '$foo'
>
> That way I can fetch the value through the interpolation path rather 
> than only checking the current section.  I suppose I could do 
> something like this:
>
> try:
>     return subsection['foo']
> except KeyError, ke:
>     subsection['foo'] = '$foo'
>     return subsection['foo']
>
> But that feels a bit hacky.  Are there any better ways to do this that 
> I'm not thinking of, or am I just going to have to buck up and put the 
> hack in?

How about setdefault?

 >>> c = ConfigObj()
 >>> c['bar'] = 'baz'
 >>> c.setdefault('foo', '%(bar)s')
     'baz'

Michael


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