首先安装依赖包，centos里面是-devel，如果在ubuntu下安装则要改成-dev，依赖包缺一不可，笔者曾安装python3未成功就是因为没有安装libffi-devel
yum -y install gcc zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel libffi-devel
然后获取python3.7的安装包
wget https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tar.xz解压
tar -xvJf Python-3.7.0.tar.xz配置python3的安装目录并安装
cd Python-3.7.0
./configure --prefix=/usr/local/bin/python3
make
make install创建软链接
ln -s /usr/local/bin/python3/bin/python3 /usr/bin/python3
ln -s /usr/local/bin/python3/bin/pip3 /usr/bin/pip3
出现上面就表示成功!!!