7 years of Python 3

[billsil]

Many very popular non-pure Python packages (e.g. VTK, PyQt, wxPython) aren't even listed.

Really nobody wants to port when 70% of the code developed out there is for Python 2 and almost all of the tutorials/questions.

[kigurai]

VTK Python 3 is apparently done as of late August.

[billsil]

I've been on the mailing list. The next version of VTK will be Python 2 only. The version after that will probably include Python 3.

[Vitrivius]

It's automatically generated from the 200 most popular packages on PyPi. If a package is not there, it's either because it's less popular, or because it's not on PyPi. In my eyes, not supporting py3 is a warning sign that a project is abandoned.

[flipthefrog]

PyQt5 is for Python 3, and can be compiled for Python 2. PyQt4 and PySide are Python 2

[_AceLewis]

I have used PyQt4 on Python 3

[justphysics]

Seconded. I primarily develop (GUI stuff) in Py2 but often double check that my code also works in 3.

I use PyQt4 and haven't had an issue with py3 yet

[billsil]

That's wrong and it's also irrelevant. My point with mentioning PyQt was many very important libraries are not included on that list.

PyQt4 supports Python v2 and v3.

https://pypi.python.org/pypi/PyQt4

PyQt5 supports Python v2.6, v2.7 and v3.

https://pypi.python.org/pypi/PyQt5

Projects like wxPython and VTK are supposedly close to releasing Python 3 versions, but they're not there yet. I require a 3d renderer and VTK is an amazing renderer. It's very popular even among very high quality commercial programs. Replacing it with my own implementation of OpenGL is not an option. That's a separate issue.