问为什么python obj.atribute会返回地址位置，而obj.atribute.atribute会返回值？

EN

class MyList:
    """stores a list and does other stuff eventualy"""
    this_list = []

    def __init__(self, *args):
        for arg in args:
            self.this_list.append(arg)

    def print_list(self):
        """prints the atribute:"description" from the stored objects in the list"""
        for x in range(len(self.this_list)):
            print(MyClassObj(self.this_list[x]).description, sep="\n")

class MyClassObj:
    """test object to be stores in the "MyList" object."""

    def __init__(self, description):
        self.description = description

class CallList:
    """creates the objects, lists and calls the print method"""
    @staticmethod
    def main():
        test1, test2 = MyClassObj("Test1"), MyClassObj("Test2")
        list1 = MyList(test1, test2)
        list1.print_list()

<__main__.MyClassObj object at 0x007908F0>
<__main__.MyClassObj object at 0x00790910>

Process finished with exit code 0

print(MyClassObj(self.this_list[x]).description.description, sep="\n")

Test1
Test2

Process finished with exit code 0