关于“about_method_bindings.py”，Koan：我如何看待（obj.method）上dir（）的长度才能得到答案“27”？

Question

在“about_method_bindings.py”Koan上，我如何查看（obj.method）上dir（）的长度才能得到答案“27”

我是python新手

class Class:
    def method(self):
        return "parrot"

class AboutMethodBindings(Koan):
   def test_methods_have_different_attributes(self):
        obj = Class()
        self.assertEqual(27, len(dir(obj.method)))

class Class:
    def method(self):
        return "parrot"

class AboutMethodBindings(Koan):
   def test_methods_have_different_attributes(self):
        obj = Class()
        self.assertEqual(27, len(dir(obj.method)))