[Python-Dev] User's complaints (original) (raw)

Fredrik Lundh fredrik at pythonware.com
Thu Jul 13 15:05:49 CEST 2006

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.

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