Confused with getattribute and setattribute in python

Question

I want to know that if I have class like this

class Test(object):
    def __init__(self):
        self.a = 20
        self.b = 30

obj = Test()

Answer 1

class test():
    def __init__(self):
        self.a = 1

    def __getattribute__(self, attr):
        print 'Getattribute:',attr

    def __getattr__(self, attr):
        print 'GetAttr:',attr

    def __dict__(self, attr):
        print 'Dict:',attr

    def __call__(self, args=None):
        print 'Called:',args

    def __getitem__(self, attr):
        print 'GetItem:',attr

    def __get__(self, instance, owner):
        print 'Get:',instance,owner

    def __int__(self):
        print 'Int'



x = test()
print x.a

None of the above will be called..

[root@faparch doxid]# python -m trace --trace test_dict.py
 --- modulename: test_dict, funcname: 
test_dict.py(1): class test():
 --- modulename: test_dict, funcname: test
test_dict.py(1): class test():
test_dict.py(2):    def __init__(self):
test_dict.py(5):    def __getattribute__(self, attr):
test_dict.py(8):    def __getattr__(self, attr):
test_dict.py(11):   def __dict__(self, attr):
test_dict.py(14):   def __call__(self, args=None):
test_dict.py(17):   def __getitem__(self, attr):
test_dict.py(20):   def __get__(self, instance, owner):
test_dict.py(23):   def __int__(self):
test_dict.py(28): x = test()
 --- modulename: test_dict, funcname: __init__
test_dict.py(3):        self.a = 1
test_dict.py(29): print x.a
1
 --- modulename: trace, funcname: _unsettrace
trace.py(80):         sys.settrace(None)

You'd might want to look into: http://docs.python.org/2/library/numbers.html#numbers.Number Most likely you'll need to implement a nested class that handles the number-class functions in order to snatch up calls such as in the example. Or, at least that's one way of doing it..

The integer value contains the following functions which you have to intercept

['__abs__', '__add__', '__and__', '__class__', '__cmp__', '__coerce__', '__delattr__', '__div__', '__divmod__', '__doc__', '__float__', '__floordiv__', '__format__', '__getattribute__', '__getnewargs__', '__hash__', '__hex__', '__index__', '__init__', '__int__', '__invert__', '__long__', '__lshift__', '__mod__', '__mul__', '__neg__', '__new__', '__nonzero__', '__oct__', '__or__', '__pos__', '__pow__', '__radd__', '__rand__', '__rdiv__', '__rdivmod__', '__reduce__', '__reduce_ex__', '__repr__', '__rfloordiv__', '__rlshift__', '__rmod__', '__rmul__', '__ror__', '__rpow__', '__rrshift__', '__rshift__', '__rsub__', '__rtruediv__', '__rxor__', '__setattr__', '__sizeof__', '__str__', '__sub__', '__subclasshook__', '__truediv__', '__trunc__', '__xor__', 'bit_length', 'conjugate', 'denominator', 'imag', 'numerator', 'real']