Question

Why do we pass L[:] to each function, rather than simply passing L? #PYTHON

Answer 1

first of all L[:] generates a new copy of the list.
when a list is passed to a function, then the function will be able to modify the list that was passed in as an input argument/parameter.
but in case if we don't want some function to modify our original list, we typically use [:] to pass the list into the function.
so, by passing L[:] function won't be able to modify th original list L.