你如何安装Python 3？

Question

我尝试过的一切都没有奏效。 sudo apt-get install python3.6给了我这个：

cat > variables.env <<EOF
TOKEN=${TOKEN}
EOF

sudo yum -y install python36给了我这个：

Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package python3.6
E: Couldn't find any package by glob 'python3.6'
E: Couldn't find any package by regex 'python3.6'

pip install python3.6给了我这个：

There are no enabled repos.

如何通过命令行安装？