How to change from default to alternative Python version on Debian LinuxWARNING Python 2 was sunset on January 1, 2020. You can still install Python 2 in order to run some legacy scripts, but it is highly recommended to update to Python 3 and, if possible, update your scripts to run on the newer Python version. There are many different versions of Python available. The two that most developers probably want to install, and which are available in Debian’s default repos
CentOS7にJupyter Notebookを導入 - Qiita
