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With tab completion enabled via rlcompleter and readline, tab-completion will assume anything that is callable (by callable(val)) is going to be called. For example, the below code defines a class "CCC" that is callable and has a static function. However, typing 
>>> CC
and then pressing tab results in the following.
>>> CCC(
Note the extra parentheses. It would be nice if these weren't added if the object also has some other reasonable choices.
However, I don't know what would be "reasonable" here. Somehow we'd have to detect whether a callable class has static methods, possibly via dir() or directly checking class.__dict__ but at this point I am not comfortable enough with python to suggest decent solutions.
>>> class CCC: 
... def __call__(self):
... print "call"
... @staticmethod
... def f(a):
... print "Static",a
... 
>>>CC<TAB>
>>>CCC(

This annoys me too, for all callable objects actually (e.g. I type "help(someprefix" then Tab then I have to delete the "(" before typing ")" and Enter), but I think it was a deliberate change. I may have the original bug report open in a browser tab at home, I’ll check.

It's issue 449227.

FWIW, count me against the automatic brackets as well. Another way it gets in the road:
>>> class C(object(. . .
In Issue 5062, Carl thought there might be a switch to turn the behaviour off. Perhaps we could add some sort of configuration option.