To test run pytest which will test test_input.csv - this csv includes the provided example in the instructions.md file.
To run with people.csv and return result results_final_applecart.csv please run python3 solution.py.
For your convenience and to save time the output file results_final_applecart.csv has already been provided in the root directory - it was run with the input file being people.csv. All matches are sorted by first_name and last_name.