ubuntu 18.04 更换默认python版本 ``` root@en-us-cpt-k8s-crm-prod:~# update-alternatives --config python There are 4 choices for the alternative python (providing /usr/bin/python). Selection Path Priority Status ------------------------------------------------------------ * 0 /usr/bin/python3 150 auto mode 1 /usr/bin/python2 100 manual mode 2 /usr/bin/python2.7 2 manual mode 3 /usr/bin/python3 150 manual mode 4 /usr/bin/python3.6 1 manual mode Press <enter> to keep the current choice[*], or type selection number: 2 update-alternatives: using /usr/bin/python2.7 to provide /usr/bin/python (python) in manual mode root@en-us-cpt-k8s-crm-prod:~# update-alternatives --config python There are 4 choices for the alternative python (providing /usr/bin/python). Selection Path Priority Status ------------------------------------------------------------ 0 /usr/bin/python3 150 auto mode 1 /usr/bin/python2 100 manual mode * 2 /usr/bin/python2.7 2 manual mode 3 /usr/bin/python3 150 manual mode 4 /usr/bin/python3.6 1 manual mode Press <enter> to keep the current choice[*], or type selection number: root@en-us-cpt-k8s-crm-prod:~# python Python 2.7.17 (default, Sep 30 2020, 13:38:04) [GCC 7.5.0] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> exit() ```