関連ワード:  how to create null variable in python    how to create empty variable in python    how to set null value in python    how to set empty variable in python    how to make a null value in python    how to create an undefined variable in python    how to create empty string variable in python    how to create empty datetime variable in python    how to create empty int variable in python    how to make a variable undefined in python  
結果 : how to create null variable in python