[Python-Dev] PEP 487: Simpler customization of class creation (original) (raw)

Guido van Rossum guido at python.org
Sun Jun 26 18:25:53 EDT 2016


One of the big issues that makes library authors reluctant to use metaclasses (even when they would be appropriate) is the risk of metaclass conflicts.

Really? I've written and reviewed a lot of metaclasses and this has never worried me. The problem is limited to multiple inheritance, right? I worry a lot about MI being imposed on classes that weren't written with MI in mind, but I've never particularly worried about the special case of metaclasses.

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