関連ワード:  how to add element in set python    how to insert element in set python    how to append element in set in python    how to add item in set python    how to add new element in set python    how to add elements in set in python using for loop    how to add element in empty set in python    how to add multiple elements in set in python    how to add object to set in python    how to add and remove elements in set in python