Sets are unordered collections of unique items. Sets are themselves mutable—we can add and remove items from them; however, the items themselves must be immutable. An important distinction with sets is that they cannot contain duplicate items. Sets are typically used to perform mathematical operations such as intersection, union, difference, and complement.
Unlike sequence types, set types do not provide any indexing or slicing operations. There are two types of set objects in Python, the mutable set object and the immutable frozenset object. Sets are created using comma-separated values within curly braces. By the way, we cannot create an empty set using a={}, because this will create a dictionary. To create an empty set, we write either a=set() or a=frozenset().
Methods and operations of sets are described in the following table:
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Method |
Description |
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len... |