Numpy supports Python 3 since version 1.5, released in August 2010. Ubuntu 12.04 and the current Debian stable carry this version. Scipy supports Python 3 since version 0.9, apparently released in 2010 as well with releases in the current Debian stable and Ubuntu 12.04.
‘Just now’ is hence a bit too late, but it is correct that many users have only been able to use Python 3 some four to five years after 2008.
I believe those versions were saddled with "experimental" wording and bugs, which made people steer away from them. This is all second-hand though, I personally never used them.
A lot of people cite that lack of NumPy support is what's keeping them from moving to Python 3, I've seen this comment more times than I can count. It seems most of them haven't done their research and found that NumPy/SciPy has had complete support for Python 3 for 4 years now.
Please don;t interpret my comments above as ignorance. I am quite aware of what is available (and was available, when I considered switching to python3). I did my research at the time (which was some 5 years ago). It looks like scipy was added about 3-4 years ago... at which point I don't care any more.
If it was valid at the time but your concerns have since been addressed, then your complaints aren't exactly relevant to someone who's reading this now and looking for information on Python 3, right?
To demonstrate the vehemence which long-term experience programmers view the lack of ability with which Guido is running the python3 project.
If he had actually addressed the important questions in Python3 (first being getting the majority of people on 3 quickly by getting the major libraries ported quickly, second being addressing the GIl in either 2 or 3 (if the GIL had been removed in 3, I would have much more strongly considered it).
If either of those had been addressed, some of us (who are influential in the area) would have adopted 3 and prosetlyized it. However, I lost so much confidence in Python after the 2 to 3 transition that I've decided to actively non-prosetylize it.
