$1.$ Move $($copy$)$ the code for the three functions $(`$calculate$\_$unique$()`,`$split$\_$dataset$()`$ and $`$calculate$\_$common$()`)$ into a file named $`$my$\_$experiment.py$`.$ This file should be stored in the same directory as this notebook.

$2.$ Add $`$numpy$`$ docstrings to each function.

$3.$ Add lines to $`$import$``$numpy$`$ as $`$np$`$ and $`$pandas$`$ as $`$pd$`$ at the top of your module.

$3.$ Save your changes to $`$my$\_$experiment.py$`$

$4.$ Return to this notebook, restart your kernel, and re$-$run all code in this notebook.

$5.$ Import the three functions using the following syntax: $`$import my$\_$experiment as exp$`.$