记录：centerOS更新python版本

python --version（或 python -V）: 查看当前python版本
# 返回Python 2.x.x 版本

cat /etc/readhat -release
# 返回：CentOS Linux release 7.5.1804 (Core) 

yum groupinstall -y "Development tools"

yum install -y zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel

mkdir /usr/local/python3

# 下载
wget https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tgz

# 移动文件，并进入python3文件夹
mv Python3.7.0.tgz /usr/local/python3

# 解压，进入python-3.7.0文件夹
tar zxf Python-3.7.0.tgz

# 默认安装在usr/local/bin下，这里这指定当前目录
./configure --prefix=/usr/local/python3

# 编译和安装
make && make install

# 查看新版
ll -tr /usr/local/bin/python*

# 查看原版
ll -tr /usr/bin/python*

# 更改系统默认旧版本名称
mv /usr/bin/python /usr/bin/python.old

# 再删除系统默认的 python-config 软链接
rm -f /usr/bin/python-config

# 创建新版本软连接
ln -s /usr/local/bin/python /usr/bin/python
ln -s /usr/local/bin/python-config /usr/bin/python-config
ln -s /usr/local/include/python3.7/ /usr/include/python3.7

python3 -V
# 返回：Python 3.7.0