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The reason why there are so many comparisons between men and women is that human beings have only two types of men and women in terms of gender, which is also the premise that the visitor model can be implemented.Stupid Methodology Python (Learn Python the Hard Way) This book is very suitable for people who have no contact with Python or programming at all. Although many people say Python is so simple that they learn it in a day/week/month, everyone's foundation is different, so don't think you are stupid without learning it in a day. You should think that the person who says so is very bad! Anyway, this is a real book to learn Python from scratch.We can see the above code; Player-to-player coupling code has been removed, However, all logical operations are put into the intermediary object for processing. Any operation of a certain player does not need to traverse to notify other players, but only needs to send a message to the intermediary. The intermediary processes the message after receiving it, and after processing the message, the processing result will be fed back to other player objects. The intermediary mode is used to remove the coupling code between objects. Make the program more flexible.科学家终于发现了往返古今、令时光倒流的神秘缺口，却无法估计原始恐龙一旦造访，今天的洛杉矶，将会出现如何灾难性的暴虐……Are you guarding me, Kapoor!