Learn about sets in python with creation, accessing and modifying the sets. See methods, functions, and operations on sets & frozen sets. It can be done with frozenset () method in Python . While elements of a set can be modified at any time, elements of the frozen set remain the same after creation. If no parameters are passed, it returns an empty frozenset. This is based on a data structure known as a hash table. Python set is an unordered collection of multiple items having different datatypes. In Python, sets are mutable, unindexed and do not contain duplicates. The order of elements in a set is not preserved and can change. Can store None values. Implemented using hash tables internally. Do not implement interfaces like Serializable or Cloneable. Python sets are not inherently thread-safe; synchronization is needed if used across threads. Creating a Set in Python In Python , the most basic and ... Python has a set of built-in methods that you can use on sets.