Issue1501932

In CPython hasattr(obj, "foo") does not invoke 
obj.__getattr__ even if "foo" not in obj.__dict__.  In 
Jython it does.

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It looks to me like both hasattr and __getattr__ actually 
invoke __findattr__.  I think hasattr may need to be 
reworked so that it does not use __findattr__.

Im trying to figure out the bug here.  From:
http://docs.python.org/lib/built-in-funcs.html

"hasattr(  	object, name)
    The arguments are an object and a string. The result is True if the string is the name of one of the object's attributes, False if not. (This is implemented by calling getattr(object, name) and seeing whether it raises an exception or not.)"

Running this code:
>>> class x:
...    def __getattr__(self, name):
...       print name

and invoking
z = x()
hasattr(z, "something")

produces the same effect on Python as well as Jython.  Im working with a Jython3005.

leouser

leouser's code sample indeed shows that jython and python behave identically with respect to the issue of hasattr invoking getattr protocol.Not sure whether this is a bug after all.Perhaps we can get a more detailed description of the bug from jeff ,maybe with a code sample that shows clearly the discrepancy between jython and python behaviour with respect to this bug

Also a point of note :if hasattr is reworked so that it does not invoke findattr then patch  1775263(still open) will be rendered invalid

Right, in theory the 2 don't differ in beavhior. I did find one 
difference, though:

Python 2.5.1 (r251:54863, Aug 19 2007, 21:02:30) 
[GCC 4.0.1 (Apple Computer, Inc. build 5367)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> class Foo(object):
...     def __getattr__(self, name):
...             raise TypeError()
... 
>>> hasattr(Foo(), 'bar')
False

Jython 2.3a0 on java1.5.0_13
Type "copyright", "credits" or "license" for more information.
>>> class Foo(object):
...     def __getattr__(self, name):
...             raise TypeError()
... 
>>> hasattr(Foo(), 'bar')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 3, in __getattr__
TypeError: 

I wonder if Jeff ran into something like this? Anyway, that anomaly is 
fixed in r4324, so I'm closing this out

really fixed this time in r4327