[Python-Dev] python2 and python3 and vim (original) (raw)

Nick Coghlan ncoghlan at gmail.com
Sun Nov 3 23:04:27 CET 2013

On 4 Nov 2013 03:00, "R. David Murray" <rdmurray at bitdance.com> wrote:

I came across this in the VIM documentation: Vim can be built in four ways (:version output): 1. No Python support (-python, -python3) 2. Python 2 support only (+python or +python/dyn, -python3) 3. Python 3 support only (-python, +python3 or +python3/dyn) 4. Python 2 and 3 support (+python/dyn, +python3/dyn) Some more details on the special case 4: When Python 2 and Python 3 are both supported they must be loaded dynamically. When doing this on Linux/Unix systems and importing global symbols, this leads to a crash when the second Python version is used. So either global symbols are loaded but only one Python version is activated, or no global symbols are loaded. The latter makes Python's "import" fail on libraries that expect the symbols to be provided by Vim. I've never played with embedding Python. Does this make sense to anyone who has? Is there some limitation in our embedding and/or import machinery here, or is this more likely to be a shortcoming on the VIM side? Mostly I'm asking out of curiosity in hopes of learning something; I doubt I'll have enough motivation to make time to work on solving this.

Essentially what Greg said - we export many of the same symbols from both shared libraries, so if you try to load both CPython 2 and 3 into one process, the dynamic linker isn't going to be happy about it at all.

Since making it work would be a lot of work for minimal benefit, the most that could realistically be done is to make it fail a little more gracefully (I believe that would need to be done on the Vim side of things, though).

Cheers, Nick.

--David

Python-Dev mailing list Python-Dev at python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/ncoghlan%40gmail.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-dev/attachments/20131104/23ded2a1/attachment.html>

More information about the Python-Dev mailing list