On Thu, Jun 16, 2011 at 11:37 PM, Steven D'Aprano <steve@pearwood.info> wrote:
What benefit is there in making inject a keyword? Even super isn't a keyword.
As far as I'm concerned, inject need only be a function in the functools module, not even a built-in, let alone a keyword.
If inject is a decorator then it would be used to inject into the locals of any function at runtime. This is in contrast to Nick's proposal where it's strictly tied to definition time and injection is internal to to the subject of the injection, the function body. In the latter case, the resulting code object from the function body could incorporate the injection right there. To accomplish the same thing with a decorator, the function definition would have to know about any possible decoration before the code object is compiled (good luck), or the decorator would replace/modify the compiled code. Seems like that's not far off from what Jan was proposing. The alternative is to have the injection handled externally to the compiled code object, like a co_static on the code object of a __static__ on the function object. Then the execution of the function code object would pull that in. -eric