In which case would you use a tuple?

Using a tuple to return multiple values from a function is an effective approach due to its immutability and simplicity. When a function needs to return more than one value, a tuple allows you to aggregate those values into a single object that can be easily returned. The immutability of tuples ensures that the returned data cannot be altered, providing a level of integrity and safety, which can be particularly useful in preventing unintended modifications of the returned values.

Furthermore, tuples are typically more lightweight than lists, making them a preferable option for returning fixed sets of data, like coordinates or multiple attributes of an object. This functionality is particularly beneficial in many programming scenarios where you want to package multiple outputs without introducing the overhead of more complex data structures.

The other contexts do not align as well with the characteristics of tuples. While some might use lists or dictionaries in those other cases, those structures do not provide the same advantages in terms of immutability and ease of use for returning values.