Let's assume a modestly sized Python program uses 8 libraries or so. Assuming 80% of libraries are ported, that means 20% aren't. The likelihood of at least one of your 8 libraries not being ported is 1 - (0.8)^8 = 83%. In other words, most people will find that at least one of their cricitcal libraries is not ported. That is certainly the case for me (Bloomberg Python API, for 2.7, and which, btw, only came out 6 months ago). Inevitably the people using Python come from specific domains, and use at least one domain specific library, so while all the common "usual suspect" libraries are ported, there is usually a very high chance that one critical library is not.
Perhaps the way the entire question should be thought of is: are there actually many properly useful Python 3 libraries that are not available in Python 2?? I bet the above equation would look much better when inverted.
Perhaps the way the entire question should be thought of is: are there actually many properly useful Python 3 libraries that are not available in Python 2?? I bet the above equation would look much better when inverted.