プログラミング言語Python Advent Calendar 過去 2016 https://qiita.com/advent-calendar/2016/python https://qiita.com/advent-calendar/2016/python_python 2015 https://qiita.com/advent-calendar/2015/python https://qiita.com/advent-calendar/2015/yet_another_python 2014 https://qiita.com/advent-calendar/2014/python 2013 https://qiita.com/advent-calendar/2013/python