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Centos7升级Python2到Python3

 2 years ago
source link: https://segmentfault.com/a/1190000040759182
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在Centos7系统中,默认带的Python版本是Python2.7的,想用到Python3的新特性就需要升级.

安装依赖包

关于Python3.7以上的版本，需要多安装一个依赖包:

> yum install -y libffi-devel

否则会出现ModuleNotFoundError: No module named _ctypes的报错。

安装python 3.7.3

# 下载
> wget https://www.python.org/ftp/python/3.7.3/Python-3.7.3.tgz
# 解压
> tar -zxf Python-3.7.3.tgz
# 安装依赖包
> yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc  libffi-devel
# 进入python目录
> cd Python-3.7.3
# 编译
> ./configure --prefix=/usr/local/python3.7
#安装
> make && make install

备份Python2版本

由于系统有些软件还是依赖Python2运行,所以不能删除Python2,需要对原来的python软连接指向python3

>mv /usr/bin/python /usr/bin/python.bak

创建新的软连接

> ln -s /usr/local/python/bin/python3.7 /usr/bin/python

查看Python版本

> python -V

更改yum配置

因为yum需要使用python2，将/usr/bin/python改为python3后，yum就不能正常运行了，因此需要更改一下yum的配置。

  • 编辑这两个文件，将文件头的#!/usr/bin/python改为#!/usr/bin/python2
> vim /usr/bin/yum
> vim /usr/libexec/urlgrabber-ext-down

原文链接:https://rumenz.com/rumenbiji/...
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