関連ワード:  python check if a value in list    python check if a value exists in list    python check if value in list of dictionaries    python check if value in list of tuples    python check if value in list of objects    python check if value in list is unique    python check if value in list of strings    python check if value in list return index    python check if value in list case insensitive    python check if value in list is nan