操作三：python3.7.3 的安装及配置（centos7）

1.下载python3源码包
打开地址，选择需要的版本
https://www.python.org/ftp/python
wget https://www.python.org/ftp/python/3.7.3/Python-3.7.3.tgz

2.下载python3编译的依赖包
yum install -y gcc patch libffi-devel python-devel zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel

3.解压缩源码包
tar -zxvf Python-3.7.3.tgz

4. 进入源码包文件夹 指定安装目录为/opt/python373
cd Python-3.7.3
./configure --prefix=/opt/python373

5.编译安装
make && make install

6. 更改linux的path变量，添加python3 修改/etc/profile系统环境变量配置文件
PATH=$PATH:/opt/python373/bin

7.重载配置文件/etc/profile
source /etc/profile

8.查看python3版本
python3 --version

9.检查python其他版号
cd /usr/bin
ls python*

10.检查python之间的依赖
cd /usr/bin
ls -al python*

11.创建软链接
ln -s /opt/python373/bin/python3 /usr/bin/python3
ln -s /opt/python373/bin/pip3 /usr/bin/pip3

12.验证 python3
pip3 -V (python 3.8.3)

13.centos7会自带python2 但是没有pip模块，不能安装三方库 这里为python2安装pip模块
安装依赖 yum -y install epel-release
安装pip yum install python-pip
验证 pip -V (python 2.7)

14.安装python插件
pip3 install -r lifishertest.txt
安装allure : pip3 install allure-pytest