python 2.x to 3.x

As of 13 Apr 2014, from http://hg.python.org/peps/rev/76d43e52d978 (PEP 373, Python 2.7 Release Schedule):

The End Of Life date (EOL, sunset date) for Python 2.7 has been moved five years into the future, to 2020. This decision was made to clarify the status of Python 2.7 and relieve worries for those users who cannot yet migrate to Python 3. See also PEP 466.

python2.7将于2020年不再支持。

即将放弃支持python 2.x的工具

发布时间线，以及扩展支持的时间，蓝色仅支持python3。