Which of the following is NOT a characteristic of Python lists?

Python lists have several defining characteristics that make them a versatile data structure. One of the primary characteristics is that Python lists are ordered collections. This means that the elements within a list maintain their order of insertion, allowing for easy access by index.

Another characteristic of Python lists is their mutability. This means that once a list is created, it can be changed; elements can be added, removed, or modified. This flexibility is one of the reasons Python lists are frequently used for various programming tasks.

Python lists also support duplicates, meaning that the same value can appear multiple times within a list. This allows developers to store related data without concern for uniqueness, making it easy to manage collections of items where repetition is valid.

In contrast, the statement that lists cannot be resized is incorrect. In Python, lists are dynamic, allowing for changes in size as items are added or removed. This characteristic enables developers to manage collections of varying lengths easily, accommodating changes as needed. Thus, the claim that lists cannot be resized is not true and makes it the correct choice for an option that is NOT a characteristic of Python lists.