関連ワード:  python for 2 elements in list    python last 2 elements in list    python swap 2 elements in list    python join 2 elements in list    python if 2 elements in list    python check if 2 elements in list    python skip first 2 elements in list    python get last 2 elements in list    python get every 2 elements in list    python iterate over 2 elements in list