One of the main differences between lists and tuples in Python is that tuples are immutable, that is, one cannot add or modify items once the tuple is initialized. For example:
You can use the += operator to "append" to a tuple - this works by creating a new tuple with the new element you "appended" and assign it to its current variable; the old tuple is not changed, but replaced!
This avoids converting to and from a list, but this is slow and is a bad practice, especially if you're going to append multiple times.
