The nature of the interpreter is that the C code implementing function calls specifically uses a dict created in C rather than using the mechanisms that would be used to create a dict from within a python program, so you have no way to "hook" your own implementation in to the interpreter without modifying the C code.On 3 Mar 2005 11:15:28 -0800, "Lonnie Princehouse" <[EMAIL PROTECTED]> wrote:
No. I don't think it's possible to read the parse tree used by the interpreter, especially as it is being created. Here are a couple of kludgy ideas that might come close, though:
Is this a 'limitation' of the current version or it is impossible for the architecture of CPython? What about pypy?
On a side note, check out the compiler module. You might find it to be friendlier and more useful than parser.
Thanks for the hint. It is what I want. Unfortunately is seem to be not well documented.
Anyway, here is an example of what I would like to do:
#begin def foo(**kwargs): print kwargs
foo(a = 1, b = 2, c = 3) #end
In the current implementation kwargs is a dict, but I need to have the keyword argument sorted. Unfortunately subclassing fron dict and installing the class in the __builtin__ module (with the name 'dict') does not work, CPython uses only builtin types.
With the compiler module I can obtain the keyword arguments in the order the were specified. The problem is how to do this for every call to foo!
Introspection does have its limits, and unfortunately that's one of them. Sine the code that interprets the byte codes is pretty much all written in C, there's no way to affect something that does not already have Python run-time hooks provided (such as the __add__ method that allows you to implement a specific response to the binary "+" operator).
What you probably need is a specific magic hook for the "**" operator, but I'm not sure that's going to happen any time soon ...
regards Steve -- Meet the Python developers and your c.l.py favorites March 23-25 Come to PyCon DC 2005 http://www.pycon.org/ Steve Holden http://www.holdenweb.com/ -- http://mail.python.org/mailman/listinfo/python-list
