Vim compiled with Python support but can't see sys version

Question

I compiled the development version of Vim with both Python 2 and Python 3 support. The output of vim --version has +python/dyn and +python3/dyn in it. I ran the configure file with g ./configure --enable-pythoninterp --enable-python3interp --with-python-config-dir=/usr/lib64/python2.7/config --with-python3-config-dir=/usr/lib64/python3.3/config --with-x --with-features=huge

However when I run :python import sys; print(sys.version) I get

E448: Could not load library function _PyArg_Parse_SizeT  
E263: Sorry, this command is disabled, the Python library could not be loaded.

Why would this be? I found out because of YouCompleteMe stating that it requires Vim compiled with 2.x support.

Thanks

Answer 1

I had a similar issue on my Debian box. If you're using a Debian-based system, you will not be able to load both Python libraries simultaneously. That's why when you set --enable-python-interp and --enable-python3-interp they always load with the /dyn suffix.

If your vim plugins don't need both versions, you should just pick one of the versions and stick with it. The links below provide more info.

Explained by Debian maintainer

Vim Python Support

P.S. - In case you tried this on Windows as well, loading either Python version will work, so the /dyn isn't an issue there.