Update information about Python 3

[svenstaro]

Python 3 and Flask is a good combination nowadays that works rather well. In fact, most PyPI libs are now ported and it's generally ok to encourage people to use Python 3 for new projects.

[DasIch]

-1

While availability of Python 3 libraries has improved, the market share remains small.

Python 2 will further be supported until at least 2020 and has recently even gained pip. The advantages of Python 3- in so far as they exist -are almost nonexistent. The conservative choice therefore remains Python 2, for the foreseeable future.

I doubt that will change within the next 4 years.

[svenstaro]

The information is still outdated, though. Most extensions are compatible. Also, my current suggestion does take into account what you said. "Unless you require absolute compatibility, you should be fine with Python 3" which implies Python 2 is a valid choice still if you need absolute compatibility. We've been using Python 3 for our new app and indeed, it's almost without problems.

I just feel the current page is way too pessimistic about Python 3 (as we all know mitsuhiko's personal stance towards Python 3). Python 3 is the way forward and we should encourage people to use it. At the very least, the information on the page should be updated.

[untitaker]

Using Flask or Werkzeug with Python 3 is absolutely not a stable affair. There are around 20 Python 3-related bugfixes in Werkzeug's master, and I don't think the majority Python 3 ports of any software currently are. I agree the ecosystem did catch up though, and the text on that page is outdated and way too pessimistic (which represents Armin's opinions very well!).

[svenstaro]

@untitaker What would you have me change in order to merge this pull request?

[untitaker]

@svenstaro I think we can say at this point that Python 3 is already a sensible choice (regarding completeness of the ecosystem), but the user might run into encoding-related bugs when using it.

[svenstaro]

How's that?

[untitaker]

@DasIch Any opinion on this now? We discussed this in IRC a bit and I like the current phrasing.

[DasIch]

Agreed, this is better.

[untitaker]

@svenstaro Thanks for this!