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Factory method pattern refers to defining a factory interface that creates an object. Its subclasses determine the classes to instantiate and postpone the actual creation to the subclasses. It emphasizes the change of "single object". The main points of its implementation include:杨长帆露出了傻白甜的笑容。70年代末期，寡妇侯玉倩意外地捡到了一个弃婴，可侯玉倩只是街道工厂的一名普通女工，家境贫寒，况且膝下已有二子，由于生活艰辛，她只能供养一个孩子念书，如果收养了这个弃婴，日子定会雪上加霜，侯玉倩只好把弃婴送走。可事情突变，当她再次看到弃婴那种不忍目睹的凄凉景象时，善良之心又让她把弃婴重新抱回家中，决心不管生活多么艰难，也要把他抚养成人，并按照孩子名字的排序，给他取名叫窦兆辉。时光迁徙，岁月流逝，窦兆辉在侯玉倩的呵护与关怀下长大成人，成为一名出色的外科医生。Changes in the body: The ability to take care of oneself is getting worse and worse, and people may be needed to help any activity. You may not be able to eat, especially solid food, or even swallow tablets, but need to eat liquid food and liquid drugs. At this stage, people often refuse to eat or take medicine.7. Os.path.isfile ()--Determines whether the specified object is a file. Yes returns True, otherwise False不，不，还是打四十板子。Zhang Liangying Spokesman: 1.5 million RMB every two years He Jie Spokesman: 1.5 million RMB every two years