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Python Reference Manual: This book is only used as a reference book. When you encounter a problem, turn over the book and consolidate it (of course, the fact may be that you went directly to Google). This kind of book does not need to be brushed from beginning to end, but only needs to be checked and filled (e-books are fine)This principle means that there are no methods in each interface that subclasses cannot use but must implement. If not, the interface must be split. It is better to use multiple isolated interfaces than to use a single interface (an interface where multiple interface methods are assembled into one).2019 Cross Area Table HOTThe phenomenon of accelerated death of cancer patients due to surgical treatment has further aroused people's fear of cancer. Nowadays, most people do not die of cancer, but of psychological fear. Therefore, we must, like the United States, carry out a large-scale publicity that cancer is a chronic disease. First of all, by solving this psychological disease well, we can reduce the mortality rate of cancer patients in our country-after all, it is the first to save lives. Every year there are 2.2 million people with cancer in our country, and 1.6 million people are killed in a year. If each person pays 100,000 yuan for treatment, the country spends 1600 trillion yuan on cancer treatment every year. We built many magnificent hospitals in exchange for 1600 trillion and 1.6 million lives. The country pays a lot of foreign exchange to buy medical equipment for cancer treatment. Many people have lost their homes and given birth because of the treatment of cancer.我不是让胖婶杀鸡了么。