[IPython-User] Tab completion doesn't work on class/instance where __getattr__ has been overridden

[Jörgen Stenarson]

Jeremy Conlin skrev 2011-03-01 20:58:
> I have a class (subclassed from list) where I have overwridden the
> __getattr__ method as:
>
>      def __getattr__(self, name):
>          if name.startswith("__"): raise AttributeError
>          def _multiplexed(*args, **kwargs):
>              return [getattr(R, name)(*args, **kwargs) for R in self]
>          return _multiplexed
>
> Now when I try to use tab completion, iPython just beeps at me and
> doesn't complete anything.  If I remove this method from my class, I
> can do tab completion.
>
> Does the tab completion use __getattr__ somewhere?  Can I add
> something to my definition to make tab completion work in iPython?
>

One way to customize which attributes are found by the completer is to 
define the __dir__ method which essentially defines what should be 
returned by a dir call.

/Jörgen