Setting ident causes Exception

[JesseBowling]

Here's a simplified proof:

>>> class Client:
...     def __init__(self, ident=None):
...             if ident:
...                     self.ident = ident
...     @property
...     def ident(self):
...             raise Exception("ident is not set")
... 
>>> client = Client()
>>> client.ident
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 7, in ident
Exception: ident is not set
>>> client = Client(ident="blah")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 4, in __init__
AttributeError: can't set attribute

Any attempts to set an ident results in such an exception.