Centos7.3安装Python3.7
Python3.7貌似又多了新的依赖，所以按照安装之前的套路安装在配置pip阶段就会出问题，比如：
ModuleNotFoundError: No module named '_ctypes'
或者报一个缺少setuptools包的错误，导致pip配不上，这才有了这篇博客，在解决问题后，将整理后的安装步骤列出来，供大家参考。淡少扯，开干！
环境
Centos7.4 # 阿里云服务器
Python3.7.0
下载相关依赖
yum groupinstall 'Development Tools' && yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel && yum -y epel-release
yum update
yum upgrade
yum dist-upgrade
yum install build-essential python-dev python-setuptools python-pip python-smbus -y
yum install build-essential libncursesw5-dev libgdbm-dev libc6-dev
yum install zlib1g-dev libsqlite3-dev tk-dev
yum install libssl-dev openssl
yum install libffi-dev
yum -y install gcc gcc-c++ zlib zlib-devel libffi-devel
yum -y install gcc kernel-devel kenel-headers make bzip2
遇到选择，一路y就行了
下载Python3.7的tar包
我们将tar包下载到 /usr/local/python，并且，该Python目录将是我们以后下载其他的Python解释器的安装目录，
mkdir /usr/local/python && cd /usr/local/python # 创建Python目录并切换到该目录下
wget https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tar.xz # download python3.7.0
解压tar包
tar -xvf Python-3.7.0.tar.xz
rm -rf Python-3.7.0.tar.xz # 将无用的tar包干掉
执行安装
ps:源码安装一般分为：
- 配置(configure)
- 编译(make)
- 安装(make install)
cd Python-3.7.0/ # 切换到解压后的目录内
./configure --prefix=/usr/local/python/python37 --enable-optimizations # 配置
make && make install # 编译后安装
此时，我们已经成功的将Python3.7安装到 /usr/local/python/python37 目录下了
配置解释器和pip的环境变量
ln -s /usr/local/python/python37/bin/python3 /usr/bin/python37 # 将解释器的环境变量名配置为Python37
ln -s /usr/local/python/python37/bin/pip3 /usr/bin/pip37 # pip的环境变量名配置为pip37
ps:因为不想动yum头对Python的依赖，这里我们在使用的时候，都用37为结尾的就行了
测试
[root@cs Python-3.7.0]# python37 -V
Python 3.7.0
[root@cs Python-3.7.0]# pip37 -V
pip 10.0.1 from /usr/local/python/python37/lib/python3.7/site-packages/pip (python 3.7)
that’s all
