In Python 3.1, there is a new builtin function I don t know in the builtins module:
__build_class__(...)
__build_class__(func, name, *bases, metaclass=None, **kwds) -> class
Internal helper function used by the class statement.
What does this function do? Why must it be in builtins if it s internal? What is the difference to the type(name, bases, dict) function?
Compiling the PEP 3115 metaclass
The PEP proposes that the class statement accepts keyword arguments,
*args, and**kwdssyntax as well as positional bases. This is a bit messy to compile and execute, but we already have this, of course, in the code for calling regular functions.So I think it would be acceptable to this into a call to a new (hidden) built-in function, named
__build_class__. Then that this class definition:class C(A, B, metaclass=M, other=42, *more_bases, *more_kwds): ...would translate into this:
C = __build_class__(<func>, C , A, B, metaclass=M, other=42, *more_bases, *more_kwds)where
<func>is a function object for the class body.
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