can anyone help convert to python3

[corsasri]

Typed ls -l /home/pi | grep tracker

pi@raspberrypi:~ $ ls -l /home/pi | grep tracker
drwxr-xr-x 3 root root 4096 Jul 16 09:09 mytracker
drwxr-xr-x 4 root root 4096 Jul 15 20:31 tracker
pi@raspberrypi:~ $

Then this and then added sudo but think i done it wrong.

pi@raspberrypi:~ $ chown -R user:group /home/pi/tracker
chown: invalid user: ‘user:group’
pi@raspberrypi:~ $ sudo chown -R user:group /home/pi/tracker
chown: invalid user: ‘user:group’
pi@raspberrypi:~ $