What is a key feature of Python lists?

Python lists are characterized primarily by their ability to allow duplicate elements. This means that within a single list, you can have multiple occurrences of the same value, which provides flexibility to store multiple related data points without needing to enforce uniqueness.

For example, if you have a list of student grades, you could have two students that received the same grade, and both can be represented as follows:

grades = [85, 90, 85, 100]

In this case, the number '85' is repeated, illustrating that lists can hold duplicates. This feature is beneficial in various scenarios, such as data analysis where repeated entries may be common.

Understanding the properties of lists is crucial for effectively utilizing them in programming. Lists also have other features, such as being mutable, which means their contents can be changed after creation, and they can contain various data types and even other lists, demonstrating their versatility in handling complex data structures.