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I follow the execution process of this small program: first, I take exp and "\ +" as parameters, call the calculation (String, String) method in the AbstractCalculator class, call split () of the same kind in the calculation (String, String), then call the calculation (int, int) method, enter the subclass from this method, after executing return num1 + num2, return the value to the AbstractCalculator class, assign it to result, and print it out. This just verifies our thinking at the beginning.围观人有些劝慰，有些震吓，有些鼓噪，混乱不堪。徐晴看着他，又想着他说的那些故事，直觉得糟化弄人。Fire automationWhen Python is programmed, it often deals with files and directories, which cannot be separated from OS modules. The OS module contains common operating system functions, independent of the specific platform. The following is a list of commonly used commandsMethodology is pieced together one by one in this way. After a long time, it can become its own methodology if it is systematized and systematized.张纪中版《西游记》以丰富瑰奇的想象描写了师徒四众在迢遥的西方途上和穷山恶水冒险斗争的历程，并将所经历的千难万险形象化为妖魔鬼怪所设置的八十一难，以动物幻化的有情的精怪生动地表现了无情的山川的险阻，并以降妖服怪歌赞了取经人排除艰难的战斗精神。”