Drop Python 2.6

[oz123]

Elementary, new projects should not use unsupported Python versions...

[eliasdorneles]

+1 from me 👍

[hugovk]

+1. Could consider dropping 3.3 too, it's not in the test matrix.

Reasons for dropping old ones

• https://en.wikipedia.org/wiki/CPython#Version_history

2.6

• Unsupported since 2013-10-29
• https://snarky.ca/stop-using-python-2-6/
• http://www.curiousefficiency.org/posts/2015/04/stop-supporting-python26.html
• http://www.python3statement.org
• Current pip 9 deprecates Python 2.6 support, pip 10 won't support it (Drop support for Python 2.6? pypa/pip#3955)
• Not much PyPI traffic (June 2016) Deprecate/Drop Support for Python 3.3? pypa/pip#3796

3.3

• Unsupported since 2017-09-29
• pip 10 will deprecate Python 3.3 support, pip 11 won't support it (Deprecate/Drop Support for Python 3.3? pypa/pip#3796)
• Very little PyPI traffic (June 2016) Deprecate/Drop Support for Python 3.3? pypa/pip#3796

[hugovk]

Here's the pip installs for cookiecutter from PyPI for the last month, showing very little 2.6 and 3.3:

$ pypinfo --percent --pip cookiecutter pyversion
python_version percent download_count
-------------- ------- --------------
3.6              87.0%        467,538
2.7              12.2%         65,623
3.5               0.6%          3,079
3.4               0.2%            952
3.7               0.0%            201
3.3               0.0%            180
2.6               0.0%             17

And, wow, look at that 3.6 percentage!

[hugovk]

@oz123 Some other places to remove 2.6:

./CONTRIBUTING.rst:3. The pull request should work for Python 2.6, 2.7, 3.3, 3.4 and 3.5, and for PyPy. Check
./{{cookiecutter.project_slug}}/CONTRIBUTING.rst:3. The pull request should work for Python 2.6, 2.7, 3.3, 3.4 and 3.5, and for PyPy. Check
./{{cookiecutter.project_slug}}/tox.ini:envlist = py26, py27, py33, py34, py35, flake8
./{{cookiecutter.project_slug}}/tox.ini:    2.6: py26
./{{cookiecutter.project_slug}}/.travis.yml:  - 2.6
./README.rst:* Tox_ testing: Setup to easily test for Python 2.6, 2.7, 3.3, 3.4, 3.5

[hugovk]

Actually, these and dropping 3.3 is proposed in PR #394.

[pydanny]

Fixed in #394