[Python-Dev] Choosing a best practice solution for Python/extension modules (original) (raw)

Steven Bethard steven.bethard at gmail.com
Sun Feb 22 19:16:18 CET 2009

On Fri, Feb 20, 2009 at 1:45 PM, Brett Cannon <brett at python.org> wrote:

But there is another issue with this: the pure Python code will never call the extension code because the globals will be bound to pypickle and not pickle. So if you have something like::

# pypickle def A(): return B() def B(): return -13 # pickle def B(): return 42 # pickle from pypickle import * try: from pickle import * except ImportError: pass If you import pickle and call pickle.A() you will get -13 which is not what you are after.

Maybe I've missed this and someone else already suggested it, but couldn't we provide a (probably C-coded) function replace_globals(module, globals) that would, say, replace the globals in _pypickle with the globals in pickle? Then you could write something like::

from _pypickle import *
try:
    from _pickle import *
    module = __import__('_pickle')
except ImportError:
    module = __import__('_pypickle')
replace_globals(module, globals())

Steve

I'm not in-sane. Indeed, I am so far out of sane that you appear a tiny blip on the distant coast of sanity. --- Bucky Katt, Get Fuzzy

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