BF: python 2.4 and 2.5 compatibility -- no "except ... as ..." yet
BF(PY2.4,2.5):  provide bin() function (introduced in 2.6)
Changelog entry
Merge pull request #647 from yarikoptic/0.8

Minor fixes for claimed compatibility with 2.4 and 2.5 -- not to be "merged" into 0.9