Linux系统中默认自带的Python版本都比较低，通常是Python2.7，对于一些要求Python高版本的项目来说就会无法继续运行，所以需要升级到python3环境，本文提供下升级Python版本的详细代码，方便后面用于查询。
Debian/Ubuntu系统
安装Python3.10
apt update && apt upgrade -y apt install git wget curl screen htop vim sudo -y apt-get --purge remove python3 python3-pip -y apt install build-essential libreadline-dev libncursesw5-dev libssl-dev libsqlite3-dev tk-dev libgdbm-dev libc6-dev libbz2-dev libffi-dev zlib1g-dev -y wget https://www.python.org/ftp/python/3.10.8/Python-3.10.8.tgz tar -xzvf Python-3.10.8.tgz cd Python-3.10.8 ./configure --prefix=/usr/local/python3 make altinstall rm -f /usr/bin/python3 rm -f /usr/local/bin/pip3 ln -s /usr/local/python3/bin/python3.10 /usr/bin/python3 ln -s /usr/local/python3/bin/pip3.10 /usr/bin/pip3 python3 -m pip install --upgrade pip python3 -V && pip3 -V
Centos7系统
安装Python3.8
yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make libffi-devel wget wget https://www.python.org/ftp/python/3.8.2/Python-3.8.2.tar.xz tar -xf Python-3.8.2.tar.xz cd Python-3.8.2 ./configure prefix=/usr/local/python3 make && make install ln -s /usr/local/python3/bin/python3.8 /usr/bin/python3 ln -s /usr/local/python3/bin/pip3.8 /usr/bin/pip3 python3.8 --version
这里没有直接链接到python，所以输入python的话还是会进入python2.7，输入python3才会进入python3.8，因为yum需要用到python2才能执行，执意要链接的话需要手动修改yum配置：
vi /usr/bin/yum 把 #! /usr/bin/python 修改为 #! /usr/bin/python2 vi /usr/libexec/urlgrabber-ext-down 把 #! /usr/bin/python 修改为 #! /usr/bin/python2
配置默认版本
如果机器内有多个python版本，可以通过设置优先级来默认使用哪个版本
sudo update-alternatives --install /usr/bin/python python /usr/bin/python2 1 sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 2
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