関連ワード:  python list check value exists    python list remove value if exists    python list of dictionaries check if value exists    python list of objects check if value exists    python check if value exists in list of tuples    python check if list value exists in another list    python check if value exists in nested list    python check if key value exists in list of dictionaries    python code to check if value exists in list    python check if value exists in list and get index