centos安装python3

众所周知，centos7自带python2.7，但没有python3，如何安装呢？

1. 先检测有没有安装python3

[js@localhost ~]$ python3
bash: python3: command not found...
Similar command is: 'python'
[js@localhost ~]$

下载依赖

su root
yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make -y
yum install libffi-devel -y

3.下载python

tar -zxvf Python-3.7.0.tgz
cd Python-3.7.0
./configure
make&&make install

4. 配置软连接

备份python命令
mv /usr/bin/python /usr/bin/python.bak
/usr/local/bin/python3指向 /usr/bin/python
ln -s /usr/local/bin/python3 /usr/bin/python
mv /usr/bin/pip /usr/bin/pip.bak
ln -s /usr/local/bin/pip3 /usr/bin/pip

5. 这时候yum不能用了
   vim /usr/libexec/urlgrabber-ext-down
   image.png
   改成python2.7
   vi /usr/bin/yum
   同理

最后，我的centos7下载于阿里镜像
http://mirrors.aliyun.com/centos/7/isos/x86_64/
CentOS-7-x86_64-Everything-1810.iso