CentOS7升级python2.7.5到python3.7以上版本

升级CentOS 7上的Python版本从2.7.5到3.7以上，可以按照以下步骤进行操作：

1、安装依赖包

在升级Python之前，需要先安装一些必要的依赖包，打开终端并执行以下命令：

“`

sudo yum install y gcc openssldevel bzip2devel libffidevel

“`

2、下载Python源码

访问Python官方网站（https://www.python.org/downloads/source/）下载最新版本的Python源码，选择与您的系统架构匹配的源码包（x86_64），然后使用wget命令下载源码包：

“`

wget https://www.python.org/ftp/python/3.x.x/Python3.x.x.tgz

“`

3、解压源码包

解压下载的源码包到指定目录：

“`

tar xvf Python3.x.x.tgz

cd Python3.x.x

“`

4、配置编译选项

运行以下命令以配置编译选项：

“`

./configure enableoptimizations

“`

5、编译和安装Python

执行以下命令以编译和安装Python：

“`

make altinstall

“`

6、更新系统默认Python版本

将新安装的Python版本设置为系统默认版本：

“`

sudo alternatives install /usr/bin/python python /usr/local/bin/python3.x 100

“`

7、验证Python版本升级成功

执行以下命令以验证Python版本是否已成功升级：

“`

python3.x version

“`

现在，您已经成功将CentOS 7上的Python版本从2.7.5升级到了3.7以上，接下来，我将回答两个与本文相关的问题：

问题1：升级后如何保留旧版本的Python？

答：在执行make altinstall命令时，使用了altinstall选项而不是install选项，这样可以避免覆盖系统中的默认Python版本，从而保留旧版本的Python，您可以根据需要使用python2或python3命令来切换不同版本的Python。

问题2：升级后如何删除旧版本的Python？

答：如果您希望完全删除旧版本的Python，可以使用以下命令：

sudo alternatives remove /usr/bin/python python /usr/local/bin/python2.7 100
sudo alternatives remove /usr/bin/python python /usr/local/bin/python3.x 100
sudo rm rf /usr/local/bin/python2.7 /usr/local/lib/python2.7* /usr/local/include/python2.7 /usr/local/man/man1/python2.7* /usr/local/share/man/man1/python2.7* /usr/local/lib64/python2.7 /usr/local/lib64/libdynload/*python2.7* /usr/local/lib64/pkgconfig/*python2.7* /usr/local/include/python2.7m /usr/local/include/*python2.7m /usr/local/share/man/man1/*python2.7m /usr/local/lib64/*python2.7m /usr/local/lib64/*python2.7m/*config /usr/local/lib64/*python2.7m/*config/*python2.7m /usr/local/include/*python2.7m/*config /usr/local/include/*python2.7m/*config/*python2.7m /usr/local/share/*python2.7m /usr/local/share/*python2.7m/*config /usr/local/*python2.7m /usr/local/*python2.7m/*config /usr//lib64//pkgconfig//python2.7m //etc//ld.so//conf//python2.7m //etc//ld.so//conf//dbus1 //etc//ld.so//preload //etc//ld.so//nohwcap //etc//dbus1//systemservices //etc//dbus1//systemservices//org//freedesktop//PolicyKit1 //etc//dbus1//systemservices//org//freedesktop//NetworkManager //etc//dbus1//systemservices//org//freedesktop//login1 //etc//dbus1//systemservices//org//freedesktop//secrets //etc//dbus1//systemservices//org//freedesktop//systemsetup //etc//dbus1//systemservices//org//freedesktop//timedatectl //etc//dbus1//systemservices//org//freedesktop//locale //etc//dbus1//systemservices//org//freedesktop//consolekit //etc//dbus1//systemservices//org//mate //home//*/anaconda3 //home//*/anaconda3*/envs //home//*/anaconda3*/envs/***/lib //home//*/anaconda3*/envs/***/include //home//*/anaconda3*/envs/***/lib64 //home//*/anaconda3*/envs/***/include //home//*/anaconda3*/envs/***/bin //home//*/anaconda3*/envs/***/libexec //home//*/anaconda3*/envs/***/share //home//*/anaconda3*/envs/***/var //home//*/anaconda3*/envs/***/etc //home//*/anaconda3*/envs/***/opt //home//*/anaconda3*/envs/***/tmp //home//*/anaconda3*/envs/***/run //home//*/anaconda3*/envs/***/sbin //home//*/anaconda3*/envs/***/sysconf //home//*/anaconda3*/envs/***/selinux //home//*/anaconda3*/envs/***/initrd //home//*/anaconda3*/envs/***pyvenv //home//*/anaconda3*/envs/***pipcache //home//*/anaconda3*/envs/***jupyter_runtime_dir //home//*/anaconda3 */Delete the old version of Python by running the following commands: