In your lab session, work with a partner through the Jupyter notebook S1 Week 09: Scikit-learn - k-Nearest Neighbours, which is available from this Github repository https://github.com/Inf2-FDS/FDS-S1-09-knn.git
(Note that the reason for "Week 09" in the title is that due to various constraints, we've had to change the normal order of the course this year.)
The instruction sheet from week 1 (see Labs section) still works - just swap in the name of the repository above instead of the one specified in the sheet.