https://trungnte.github.io/my-fcj-blog/python/04-sets/index.html1. Overview Set: is an unordered collection of unique objects. A set can be created from a tuple or list Shell >>> a = [3, 4, 5] >>> s = set(a) >>> print(s) {3, 4, 5} >>> type(s) <class 'set'> 2. Some notes 2.1 Duplicates Important Duplicates are ignored Shell >>> a = [3, 4, 5] >>> s = set(a) >>> print(s) {3, 4, 5} >>> type(s) <class 'set'> >>> >>> a = [3, 3, 5] >>> s = set(a) >>> print(s) {3, 5} >>> 2.2 The | operator and the & operator Shell >>> a = set([3, 4, 5]) >>> b = set([4, 5, 6]) >>> print(a) {3, 4, 5} >>> print(b) {4, 5, 6} >>> print(a | b) {3, 4, 5, 6} >>> print(a & b) {4, 5} >>> 2.3 The - operator and the ^ operator Shell >>> print(a) {3, 4, 5} >>> print(b) {4, 5, 6} >>> print(b - a) {6} >>> print(b ^ a) {3, 6} >>>Hugoen