In [54]: class Person():
....: name = 'yanxiaori'
....:
In [55]: p1 = Person()
In [56]: p2 = Person()
In [57]: print p1.name
yanxiaori
In [58]: p1.name = 'yandari'
In [59]: print p2.name
yanxiaori
In [60]: print Person.name
yanxiaori
In [61]:
實(shí)例屬性訪問時(shí)，先搜索實(shí)例命名空間內(nèi)田巴，沒有的話就搜索類中的允耿，不行就繼續(xù)搜索繼承樹種的基類
