macOS
$ brew install python3
$ brew link python@3.8
Ubuntu
Install ppa
This PPA contains more recent Python versions packaged for Ubuntu. Install ppa by running the following command.
$ sudo add-apt-repository ppa:deadsnakes/ppa
Update packeges
Now, update your packages by running the following command.
$ sudo apt-get update
安装Python3.8
$ sudo apt-get install python3.8
Add python3.6 & python3.7 to update-alternatives
$ sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.7 1
$ sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.8 2
Update python3 to point to python3.8
$ sudo update-alternatives --config python3
Enter 2 for python3.8
Test the version of python
$ python3 -V
Python 3.8.0
Reference
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