Inexplicable behaviour of <type 'function'>

[Leif K-Brooks]

Fabiano Sidler wrote:
> Have a look to the following lines of code:
> --- snip ---
> class Foo: pass
> def bar(): pass
> Foo.bar = bar
> --- snap ---
> 
> Why does 'bar.__get__(Foo) is Foo.bar' evaluate to False here? Did I
> misunderstand the descriptor protocol?

bar.__get__(None, Bar) is what you meant (the first argument is the 
object, not the type), but even then the result will be False, because 
the __get__ method on functions returns a different object each time 
it's called:


  >>> class Foo(object):
  ...     def bar(self):
  ...         pass
  ...
  >>> Foo.bar is Foo.bar
  False