関連ワード:  how to check string value in python    how to compare string value in python    how to find string value in python    how to check if value in string python    how to check if a string contains a value in python    how to check if a string value is null in python    how to check if a string value is nan in python    how to check if a string value is empty in python    how to check if a string value is an integer in python    how to check value is string or not in python