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To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: Moving to Python 3.x
Date: Sat, 09 May 2015 15:58:13 -0400
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Xref: csiph.com comp.lang.python:90246

On 5/9/2015 2:30 PM, Antranig Vartanian wrote:
> Hay,
>
> I learned the basics of python using the book "Think Python"
> (http://www.greenteapress.com/thinkpython/) which was good (IMHO), and
> it teaches in Python 2.7. Now I'm trying to write my first python+gtk
> program.
>
> anyways, my question will be, is it so necessary to move to python3.x
> ASAP? or Python2.7 will live for a while (2-3 years)?.

1.5 is still in use, so that is not exactly the issue.

I and many here recommend starting with current 3.x unless there is a 
compelling reason otherwise:
1. learning from a 2.7 book;
2. employer requires 2.7
3. using 2.x only module.  If you are determined to use gtk and are 
using the PyGTK bindings https://pypi.python.org/pypi/PyGTK/2.24.0
then you have no choice.

If you write 2.7 code, make it as 3.x-like as sensible.  Others may post 
some links.

If you use unicode, you might be happier with 3.x or even have to use it.

-- 
Terry Jan Reedy