What is the term for the value that selects one element of a list?

The term for the value that selects one element of a list is the index. In Python, lists are ordered collections of items, and each item can be accessed based on its numerical position within the list. The index represents this position and is zero-based, meaning the first element of the list is accessed with an index of 0, the second with an index of 1, and so on.

For example, in a list defined as my_list = ['apple', 'banana', 'cherry'], you can access 'banana' using my_list[1], where 1 is the index corresponding to 'banana'. Understanding how indexes work is fundamental for effectively working with lists in Python, enabling you to retrieve, modify, or remove elements based on their position.