Python相当于PHP的__call()魔术方法？

Question

在PHP中,我可以这样做:

class MyClass
{
  function __call($name, $args)
  {
    print('you tried to call a the method named: ' . $name);
  }
}
$Obj = new MyClass();
$Obj->nonexistant_method();   // prints "you tried to call a method named: nonexistant_method"

这对于我正在处理的项目能够用Python来做是很方便的(要解析许多讨厌的XML,将它转换为对象并且能够只调用方法会很好.

Python有相同的功能吗？

Answer 1

在对象上定义__getattr__方法,并从中返回一个函数(或闭包).

In [1]: class A:
   ...:     def __getattr__(self, name):
   ...:         def function():
   ...:             print("You tried to call a method named: %s" % name)
   ...:         return function
   ...:     
   ...:     

In [2]: a = A()

In [3]: a.test()
You tried to call a method named: test