ubuntu安装python3.10并设置默认

安装新版python：

sudo apt update && sudo apt upgrade -y

sudo apt install software-properties-common -y

sudo add-apt-repository ppa:deadsnakes/ppa

sudo apt install python3.10

验证版本

python3.10 --version

## 设置Python3.10 默认

$ python3 --version

Python 3.6.9

$ sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.6 1

update-alternatives: using /usr/bin/python3.6 to provide /usr/bin/python3 (python3) in auto mode

python3.10 --version

Python 3.10.4

$ sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.10 2

update-alternatives: using /usr/bin/python3.10 to provide /usr/bin/python3 (python3) in auto mode

$ sudo update-alternatives --config python3

There are 2 choices for the alternative python3 (providing /usr/bin/python3).

  Selection    Path                Priority  Status

------------------------------------------------------------

* 0            /usr/bin/python3.10  2        auto mode

  1            /usr/bin/python3.10  2        manual mode

  2            /usr/bin/python3.6    1        manual mode

Press to keep the current choice[*], or type selection number: 1

安装pip3

python3.10版本pip3貌似有问题，我降到3.9了。

出现问题：

ImportError: cannot import name 'sysconfig' from 'distutils' (/usr/lib/python3.9/distutils/__init__.py)

sudo apt install python3.9-distutils

sudo add-apt-repository

添加仓库出现错误：

ModuleNotFoundError: No module named 'apt_pkg'

修改：

/usr/bin/add-apt-repository 中文件头指向原始python版本

如：#!/usr/bin/python3.6