[Python-ideas] Ordered storage of keyword arguments (original) (raw)

Antoine Pitrou solipsis at pitrou.net
Fri Oct 29 11:38:41 CEST 2010

Le vendredi 29 octobre 2010 à 11:15 +0200, M.-A. Lemburg a écrit :

Would other Python implementations be able to provide the same information ?

Probably, yes.

Can this be generalized to arbitrary classes ?

In CPython, it could be done by modifying the default build_class function (which always gets called regardless of metaclasses and other stuff). Of course, it won't work if the metaclass forbids setting attributes on the class object.

Here's a pure Python prototype:

import builtins, types

_old_build_class = builtins.build_class

def build_class(func, name, *bases, **kwds): cls = _old_build_class(func, name, *bases, **kwds) # Extract the code object used to create the class namespace co = func.code cls.deforder = tuple(n for n in co.co_names if n in cls.dict) return cls

builtins.build_class = build_class

class C: y = 5 z = staticmethod(len) def x(): pass

print(C.deforder)

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