python default setting

python でTABキーを２回押す

python python2.7-config python3.6
python-config python3 python3.6m
python2 python3-config python3.8
python2-config python3-futurize python3.8-config
python2.7 python3-pasteurize python3.9

sudo update-alternatives –install /usr/bin/python python /usr/bin/python2.7 1
sudo update-alternatives –install /usr/bin/python python /usr/bin/python3.9 2

sudo update-alternatives –config python

python -V