関連ワード:  how to add elements in python set    how to add values in set python    how to insert element in set python    how to add element into set python    how to add elements in set in python using for loop    how to add elements in empty set in python    how to add multiple elements to set python    how to sum elements of set in python    how to add list elements to set in python    how to add and remove elements in set in python