takes 3 positional arguments but 4 were given错误

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之前写程序经常会碰到此类问题,确认发现并没有少参数。后来恍然大悟:函数为类下函数,定义时需要添加self参数。

但是!但是!为何Python给self赋值而你不必给self赋值?

创建了一个类MyClass,实例化MyClass得到了MyObject这个对象,
然后调用这个对象的方法MyObject.method(arg1,arg2),
这个过程中Python会自动转为Myclass.mehod(MyObject,arg1,arg2)。

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