CentOS 7.4 install python3

```bash
# https://www.rosehosting.com/blog/how-to-install-python-3-6-4-on-centos-7/
sudo yum install -y https://centos7.iuscommunity.org/ius-release.rpm
sudo yum update
sudo yum install -y python36u python36u-libs python36u-devel python36u-pip
python3.6 -V
```