Set

• Set literals are enclosed in braces.
• Duplicate element are removed on construction.
• Sets have arbitrary.
• Checking whether an element is in the set is a constant time operation.
• Methods:
  • union
  • intersection They do not change the set but create new sets.
  • add
  • remove
• Sets are mutable but the element of set should be hashable, which means it should be immutable.