関連ワード:  how to use nested lists in python    how to create nested lists in python    how to access nested lists in python    how to create nested list in python dynamically    how to work with nested lists in python    how to create a nested list in python with user input    how to access nested list elements in python    how to create nested list in python using for loop    how to create empty nested list in python    how to access nested list in dictionary python