Currently we can directly use python3.6 on VoCore2.
Install python3 is easy, need to download some ipk packages.
I have uploaded them to http://vonger.cn/misc/vocore2/ipk/
Download the ipk files to VoCore2 /tmp folder, call opkg install *.ipk to install.
note: or download from http://downloads.openwrt.org/releases/18.06.5/packages/mipsel_24kc/packages/, it should be latest version.