As an example of why Python 2 is going to be the primary Python for me due to circumstances beyond my control, the following two are examples of open-source "Py

As an example of why Python 2 is going to be the primary Python for me due to circumstances beyond my control, the following two are examples of open-source "Python" software I (and a huge percentage of the structural biologist community) use for 75%-85% of work: http://sourceforge.net/projects/pymol/ http://sourceforge.net/projects/pymol/ http://www.phenix-online.org/ http://www.phenix-online.org/ Both work on Python 2 only! So guess what, I have to write all the extensions and analysis plugins in Python 2 if want them working with those packages. Want to even dare trying to move those two packages to Python 3? See you in a decade!