urso/msgpack-python — comment on commit d685614138e588dc82b84cddae254fc120279762
File:  line 0
By methane:

Conditional expressions is enabled from 2.5.
http://docs.python.org/release/2.6.7/whatsnew/2.5.html#pep-308-conditional-expressions

Are you talking about Python<=2.4?
I don't check that msgpack-python works on Python 2.4. But If it works, no problems to pull this.