linux自带了Python2而且这个Python2不能被删除，因为有很多系统命令，比如yum都要用到。
输入python命令，查看可以得知是Python2.7.5版本
[root@GuangBo ~]# python
Python 2.7.5 (default, Jun 20 2019, 20:27:34)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-36)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>
输入which python可以查看python所在目录
[root@GuangBo ~]# which python
/usr/bin/python
下面开始安装Python3
首先安装依赖包
yum -y groupinstall "Development tools"
yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel
创建Python目录
mkdir python3
cd python3/
下载Python3.7.4
wget https://www.python.org/ftp/python/3.7.4/Python-3.7.4.tar.xz
TP:如果速度不够快，可以直接去官网下载，利用WinSCP等软件传到服务器上指定位置，我的存放目录是/home/<个人目录>/python3
然后解压压缩包，进入该目录，安装Python3
tar -zxvf Python-3.7.4
cd Python-3.7.4/
./configure --prefix=/home/GuangBo/python3
make && make install
出错了~
ModuleNotFoundError: No module named '_ctypes'
make: *** [install] 错误 1
3.7版本需要一个新的包libffi-devel，安装此包之后再次进行编译安装即可。
yum install libffi-devel -y
make install
安装成功。创建软链
# ln -s /home/GuangBo/python3/bin/python3 /usr/bin/python3
# ln -s /home/GuangBo/python3/bin/pip3 /usr/bin/pip3
到此结束！~
