在Python中，对这两个东西有明确的规定：函数function —— A series of statements which returns some value to a caller. It can also be passed zero or more arguments which may be used in the execution of the body.方法method —— A function which is defined inside a class body. If called as an attribute of an instance of that class, the method will get the instance object as its first argument (which is usually called self).从定义的角度上看，我们知道函数(function)就相当于一个数学公式，它理论上不与其它东西关系，它只需要相关的参数就可以。所以普通的在module中定义的称谓函数是很有道理的。那么方法的意思就很明确了，它是与某个对象相互关联的，也就是说它的实现与某个对象有关联关系。这就是方法。虽然它的定义方式和函数是一样的。也就是说，在Class定义的函数就是方法。