Ubuntu安装配置切换Python3版本的解决方法

sudo apt update

sudo apt install software-properties-common

sudo add-apt-repository ppa:deadsnakes/ppa

sudo apt install python3.9

python3.9 --version

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

sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.9 2

sudo update-alternatives --config python3

python3 --version

ModuleNotFoundError: No module named 'apt_pkg'问题的解决方法

cd /usr/lib/python3/dist-packages/

sudo ln -s apt_pkg.cpython-36m-x86_64-linux-gnu.so apt_pkg.so

如果报apt_pkg.so已存在，则使用命令

sudo ln -fs apt_pkg.cpython-36m-x86_64-linux-gnu.so apt_pkg.so

强制添加

参考链接

​https://www.itsupportwale.com/blog/how-to-upgrade-to-python-3-7-on-ubuntu-18-10/ ">​https://www.itsupportwale.com/blog/how-to-upgrade-to-python-3-7-on-ubuntu-18-10/ ​​

安装Python3各版本，根据实际需求切换Python版本

sudo apt install python3.6

sudo apt install python3.7

sudo apt install python3.8

sudo apt install python3.9

sudo update-alternatives --config python3

python3 --version 

ImportError: cannot import name 'sysconfig'问题的解决方法

pip3

sudo apt-get remove python3-pip

sudo vim /etc/apt/sources.list

添加如下源

deb http://cn.archive.ubuntu.com/ubuntu bionic main multiverse restricted universe

deb http://cn.archive.ubuntu.com/ubuntu bionic-updates main multiverse restricted universe

deb http://cn.archive.ubuntu.com/ubuntu bionic-security main multiverse restricted universe

deb http://cn.archive.ubuntu.com/ubuntu bionic-proposed main multiverse restricted universe 

sudo apt-get update

sudo apt upgrade

sudo apt-get install python3-pip

sudo apt-get install python3-distutils

sudo update-alternatives --config python3

python3 --version 

如果希望默认python版本为python3，而不是python 2.x, 请参考此教程

​https://www.jianshu.com/p/48b1675495e8">​https://www.jianshu.com/p/48b1675495e8​​

欢迎各位关注微信公众号