The simple values up to strings were all immutable, but lists and everything else was mutable.
then the += will modify the list, and then raise an exception because you can’t assign to that tuple item because the tuple is immutable, but the list will have been mutated.
。业内人士推荐im钱包官方下载作为进阶阅读
Servers in 105 countries
Раскрыты подробности похищения ребенка в Смоленске09:27
美國與以色列連續第四天對伊朗境內多個目標發動空襲。美國總統特朗普（Donald Trump，川普）宣稱，伊朗的防空系統、空軍、海軍及領導層「已不復存在」。