[swdunlop]

Python 3 has one really significant problem for me -- many of my dependencies don't support Python 3 well or at all. That keeps me and my own modules locked in Python 2. Python used to be the language that bragged about coming with "batteries included", but it is slowly becoming the language that requires new batteries.

[briancurtin]

I'm also not sure your battery analogy works. The batteries that came with Python 2 (the standard library) are still charged up in Python 3. Third-party projects not porting certainly does affect you and others, but it's not the same thing.