Just for the reference: "What's new in Python 3.0" page says:

> Removed callable(). Instead of callable(f) you can use isinstance(f, collections.Callable). The operator.isCallable() function is also gone.

There doesn't seem to be any indication than in two-versions time anyone would feel a need to resurrect it.

It might be not "obvious", but it's consistent with the check for other attributes. And I doubt that it's any more non-obvious than the need to use it in a first place.