1.首先来看一下系统版本
[root@python3 ~]# cat /etc/redhat-release CentOS Linux release 7.6.1810 (Core)
2.安装python3.7之前需要先安装一些依赖，，这也是上面更新yum源的原因
[root@python3 ~]# yum -y install zlib-devel bzip2-devel openssl-devel openssl-static ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel libffi-devel lzma gcc [root@python3 ~]# yum -y groupinstall "Development tools"
不安装也有可能不会报错，但是安装了一定不会报错，安不安装自己把握。
3.下载python3.7.5安装包，方法很多，我这里直接用wget从官网上下载
[root@python3 ~]# cd /usr/local/src/
[root@python3 src]# wget https://www.python.org/ftp/python/3.7.5/Python-3.7.5.tar.xz
将安装包下载到/usr/local/src/目录下
4.解压&&移动
[root@python3 src]# tar xvf Python3.7.5.tar.xz [root@python3 src]# mv Python3.7.5 /usr/local/python3.7.5 [root@python3 src]# cd /usr/local/python3.7.5/
5.安装&&编译
[root@python3 python-3.7]# ./configure --prefix=/usr/local/sbin/python3.7.5
将python3.7安装到/usr/local/sbin/python-3.7目录下
[root@python3 python-3.7]# make && make install
安装完成后，若出现以下两行，说明安装成功；
Installing collected packages: setuptools, pip Successfully installed pip-10.0.1 setuptools-39.0.1
6.安装成功之后就能使用了
[root@python3 python-3.7]# /usr/local/sbin/python3.7.5/bin/python3 Python 3.7.0 (default, Mar 15 2019, 00:44:37) [GCC 4.8.5 20150623 (Red Hat 4.8.5-36)] on linux Type "help", "copyright", "credits" or "license" for more information. >>> 【此处退出的命令 exit()】
7.看一下python命令的绝对路径
➜ softSource ll /usr/bin/ |grep python lrwxrwxrwx 1 root root 9 10月 28 23:12 python2 -> python2.7 -rwxr-xr-x 1 root root 7.1K 8月 7 08:52 python2.7 -rwxr-xr-x 1 root root 1.8K 8月 7 08:51 python2.7-config lrwxrwxrwx 1 root root 16 10月 28 23:12 python2-config -> python2.7-config lrwxrwxrwx 1 root root 24 11月 15 15:24 python3.6 -> /usr/local/bin/python3.6 lrwxrwxrwx 1 root root 40 11月 11 15:38 python3.7 -> /home/softSource/python3.5/lib/python3.7 lrwxrwxrwx 1 root root 18 11月 15 14:49 python.backup -> /usr/bin/python2.x lrwxrwxrwx 1 root root 14 10月 28 23:12 python-config -> python2-config
以下内容根据情况使用
8.将python命令通过软链接指向到python3命令
[root@python3 ~]# ll /usr/bin/ |grep python [root@python3 ~]#ln -s /usr/local/sbin/python.3.7.5/bin/python3 /usr/bin/python3.7.5
9.查看现在python3.7.5的版本
[root@python3 ~]# python3.7.5 -V Python 3.7.5
10. （选择性谨慎修改）修改完python默认版本之后，会存不能执行yum命令，需要做一些修改，如下：
①将/usr/bin/yum的顶部的： !/usr/bin/python 改成 !/usr/bin/python2.7 ②将/usr/libexec/urlgrabber-ext-down的顶部的： /usr/bin/python 改为 /usr/bin/python2.7 ③将/usr/bin/yum-config-manager的顶部的 #!/usr/bin/python 改为 #!/usr/bin/python2.7
11. （选择性谨慎修改）最后将pip指向到python3.7
[root@python3 ~]# ln -s /usr/local/sbin/python3.7.5/bin/pip3 /usr/bin/pip3
9.查看现在的pip3版本
[root@python3 ~]# pip3 --version pip 19.2.3 from /usr/local/sbin/python.3.7.5/lib/python3.7/site-packages/pip (python 3.7)