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I'm struggling to understand this bug. I've tried idle and plain cPython and neither exhibit it. I suspect thats due to how readline is itself tokenizing things.
Python 3.6.0a0 (default:ef5a2ba9df62, Jul 28 2015, 15:48:19) 
[GCC 4.9.1] on linux
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>>> readline.parse_and_bind("tab: complete")
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
NameError: name 'readline' is not defined
>>> import readline
>>> readline.parse_and_bind("tab: complete")
>>> class A:
... def foo(self):pass
... def foobar(self):pass
... 
>>> A.foo
A.foo( A.foobar( 
>>> A.foo( 
Whats probably not obvious there is that TAB at the ( indented a tab, rather than offering any completions.
I'm hesitant to apply this without a deeper understanding of where its used, in case of side effects.