You can install Python 3 on your Oracle Linux 7 environment with three simple steps:
sudo yum install -y yum-utils
sudo yum-config-manager --enable *EPEL
sudo yum install -y python36
As a first step, in case you don’t have it yet on your system, is to install the
yum-utils package. This package includes the
yum-config-manager which allows you to easily enable and disable
yum repositories, amongst other tasks.