[Python-Dev] User's complaints

[Fredrik Lundh]

Nick Coghlan wrote:

>> The person whose 'complaints' I was stating says that DSLs (Domain
>> Specific Languages for those who, like me, were confused about the
>> acronym) are a big part of what he is after and one per interpreter is
>> fine by him. He also realises that the application(s) he needs them
>> for might be unusual. He doesn't specifically need the builtin types
>> to be extendable. It's just nice to be able to define a single class
>> in multiple modules. Even C++ allows this to some extent (but not as
>> much as he'd like).
>
> I'm somewhat confused as to how Python's classes aren't open. Sure, types like
> the builtin types that don't have a __dict__ aren't open because there isn't
> anywhere to put the extensions, but metaclassing lets you do whatever you want
> to any other class:

you don't even need metaclass trickery to deal with the "define a single
class in multiple modules" problem; just use multiple inheritance to bring
all the component classes together.

</F>