Hi,
Yes, it's possible to install python3 to RUT955, however router doesn't have enough memory for this package. So before installing it, you have to expand router memory with USB flash or microSD card. To do this follow these instructions:
In router command line enter these lines (note: if you are using microSD card instead of mnt/sda1 use /mnt/mmcblk0p1):
sed -i 's#PATH=#PATH=/mnt/sda1/bin:/mnt/sda1/usr/bin:/mnt/sda1/usr/local/bin:/mnt/sda1/sbin:/mnt/sda1/usr/sbin:/mnt/sda1/usr/local/sbin:#' /etc/profile
echo >> /etc/profile
echo 'export LD_LIBRARY_PATH=/mnt/sda1/lib:/mnt/sda1/usr/lib:/mnt/sda1/usr/local/lib:$LD_LIBRARY_PATH' >> /etc/profile
echo 'dest usb /mnt/sda1' >> /etc/opkg.conf
opkg update
reboot -f
Then to install opkg packages uses theses commands:
opkg update
opkg -d usb install PACKAGE
For example, to install python3:
opkg -d usb install python3
If you get any error messages, please ignore them, everything was installed properly.