It has always seemed to me that Python 3 was mainly a fix on the philosophy of handling strings, but that it didn't offered a clear practical advantage for programmers already handling strings with care. I don't think there is a practical reason to upgrade to Python 3 in terms of language design. The reason will be in term of survival as the community seems to be willing to follow the Python 3 movement and official support for Python 2 ends in 2020.
There are a lot of reasons to upgrade! There is so much more useful stuff in python 3!
Even if you think you would not use those features, other libraries you may use might benefit a lot from it.
A few features: async/await, lists (and others) use iterators, no var leaking in list comprehensions, super().my_method() instead of super(MyClass, self).my_method(), class MyClass: instead of class MyClass(object):, improved exception handling, required arguments, ", ".join(["etc"]* 1000)
Besides that: a much improved standard library, although that technically not is language design.
ah well, it was just a geeky way to say etc etc etc.... no python3 stuff intended to be used there. Sorry :)
This one then, althoug it sort of works in python 2 as well..
