Add a method to an existing class

[Bruce Edge]

I have some idl generated classes. I'd like to add a __repr__ method to
control default output representation.
So, my question is, how does one add a method to an existing class when
you don't have control of the class definition.

eg:

>>> class xx:
...	def __init__(self):
...		self.i = 99

>>> x = xx()

Now, I want to add __repr__ to class xx. I tried the following:

>>> def str(self):
...  return "%d" % self.i

>>> xx.__dict__['__repr__']=str
>>> x=xx()
>>> x
99



It works, but I'm wondering if this is the right way.

Thanks, Bruce.