getattribute

属性访问拦截器 

class Itcast(object):
    def __init__(self,subject1):
        self.subject1 = subject1
        self.subject2 = "go"
    #属性访问拦截器，打log
    def __getattribute__(self, item):
        print("---1>%s" %item)
        if item == "subject1":
            print("log subject1")
            return 'redirect python'
        else:
            temp = object.__getattribute__(self,item)
            print("---2>%s"%str(temp))
            return temp
    def show(self):
        print("this is Itcast")

s = Itcast("python")
print("--------1--------")
print(s.subject1)
print("--------2--------")
print(s.subject2)
print("--------3--------")
s.show()
print("--------4--------")

　　输出

--------1--------
---1>subject1
log subject1
redirect python
--------2--------
---1>subject2
---2>go
go
--------3--------
---1>show
---2><bound method Itcast.show of <__main__.Itcast object at 0x000001F47161A860>>
this is Itcast
--------4--------