[Python-Dev] PEP 292: method names

[Erik Heneryd]

Barry Warsaw wrote:
> On Sat, 2004-09-11 at 09:04, Erik Heneryd wrote:
> 
> 
>>Come to think of it, I really like the more OO-ish approach better, than 
>>to cram everything into a single class.  Is the safe_substitute really 
>>that special it deserves a special method?
> 
> 
> Yes.
> 
> 
>>  Is it really the one, true 
>>way to do a "safe" substitution?  
> 
> 
> Probably not.
> 
> 
>>IIRC DOS and sh don't agree, so it's 
>>not that obvious.
> 
> 
> I'm sorry I don't follow that one.

DOS: '%NOTFOUND%' => '%NOTFOUND%'
sh: '$NOTFOUND' => ''

BTW, what about a closing delimiter in the standard regex?

>>I say keep the inheritance thing, it's much more flexible, and delegate 
>>the KeyError condition to an overridable method.
> 
> 
> After the lengthy discussions on python-dev, I'm viewing the role of the
> Template class a little differently, so I think it's fine to put them
> both in one class.

I think there are more use cases for a KeyError hook than just sh-style 
substitution; a default value, a computed value (think replacing html 
entities - returning chr(idpattern) on KeyError) etc...

I hope you don't do pep-292 just to fill your own needs (i18n?), but 
also keep your mind open to other uses...


Erik