在定义类的过程中，无论是显式创建类的构造方法，还是向类中添加实例方法，都要求将 self 参数作为方法的第一个参数。例如，定义一个 Person 类：
I want to write to a file without overwriting anything.It is a text file containing records.When I delete a specific record, I do not actually remove it from the file, I just 开发者_C百科put informati
加载中,请稍侯......