[martincho]

What is needed is a very high quality Python 2.x to 3.x migration or conversion tool to make library conversions trivial. If developers knew they could convert any 2.x code to 3.x code with no effort at all and with absolute certainty of proper operation they would probably migrate to the latest 3.x release en-masse.

How difficult would something like this be?

This might be really naive on my part. I haven't really taken the time to study the differences between 2 and 3. I have avoided 3.x out of entirely selfish reasons: I simply don't have the clock cycles to run into roadblocks.

These days languages are only as valuable as the breath and quality of the libraries around them. The issue with 3.x is that it created fear of not having access to small and large libraries developers leverage every day to be able to focus on their problem and not the problem addressed by the library. In that regard it is easy to be inclined to criticize Python leadership for approaching the transition with what might be perceived as a lack of consideration and understanding of the factors that might hinder it.

EDIT:

Just learned about 2to3:

http://docs.python.org/2/library/2to3.html

Not sure how good it is. A quick look at the page gave me the sense that it might be somewhat involved. A true converter would be something that is as easy to use as the the import statement. Something like:

    import2to3 <some_module>, <some_destination_directory>

It should not require any more thought than that and it should be 100% reliable.

[sly010]

TBH i never understood the reason for 2to3. Wouldn't a 3 to 2 compiler would be much better? Then people could start using python3 as intended, and simply compile back to python2 if they need to. I doubt there is anything it python3 that would be impossible to emulate with machine generated python2. And no one would care how the compiled python2 code looks, because it would be temporary.

[huxley]

You may want to look instead at six which let's you write code that works with both py2 and py3: http://pythonhosted.org/six/