[Python-Dev] Accessing globals without dict lookup (original) (raw)

Guido van Rossum guido@python.org
Mon, 11 Feb 2002 09:31:32 -0500

Just a few quick questions before go back into lurcking mode:

Note that I've moved my design to a new PEP, PEP 280. Tim has added his approach there too. Please read it!!!

Will it still be possible to: a) install new builtins in the builtin namespace and have them available in all already loaded modules right away ? b) override builtins (e.g. open()) with my own copies (e.g. to increase security) in a way that makes these new copies override the previous ones in all modules ?

Yes, this is the whole point of this design. In the original approach, when LOAD_GLOBAL_CELL finds a NULL in the second cell, it should go back to see if the builtins dict has been modified (the pseudo code doesn't have this yet). Tim's alternative also takes care of this.

Also, how does the new scheme get along with the restricted execution model ?

Yes, again.

(I have a feeling that this model needs some auditing since so many new ways of accessing variables and attributes were introduced since the days of 1.5.2)

You may be right.

--Guido van Rossum (home page: http://www.python.org/~guido/)