Which data structure does not allow duplicate values? List Tuple Dictionary Set

Break Down the Problem

1. Identify the characteristics of each data structure listed: List, Tuple, Dictionary, and Set.
2. Determine which of these structures allow for duplicates and which do not.

Relevant Concepts

1. List: An ordered collection that allows duplicate values.
2. Tuple: Similar to a list but is immutable, also allows duplicates.
3. Dictionary: A collection of key-value pairs where keys must be unique, but the values can be duplicates.
4. Set: An unordered collection that does not allow duplicate values.

Analysis and Detail

1. Lists can contain multiple items of the same value, such as [1, 2, 2, 3].
2. Tuples also allow duplicates, demonstrated by (1, 2, 2, 3).
3. Dictionaries ensure that all keys are unique, so the keys do not allow duplicates, but the values can repeat, such as {'a': 1, 'b': 1, 'c': 2} where keys 'a' and 'b' are unique.
4. Sets are specifically designed to hold unique values, meaning the same value cannot be added more than once. For example, the set {1, 2, 3} cannot include another 2.

Verify and Summarize

From the analysis, we can confirm that the only data structure that explicitly does not allow any duplicate values is the Set.

Final Answer

The data structure that does not allow duplicate values is Set.