inspect.getmembers() does not seem to be working on Python 3.4 with the predicate argument -- I would expect the last call to return information for `a` and `b`.

gistfile1.txt

% python3
Python 3.4.1 (default, May 19 2014, 13:10:29) 
[GCC 4.2.1 Compatible Apple LLVM 5.1 (clang-503.0.40)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> class Foo(object):
...   def a(self):
...     pass
...   def b(self, nothing):
...     pass
... 
>>> import inspect
>>> inspect.getmembers(Foo)
[('__class__', <class 'type'>), ('__delattr__', <slot wrapper '__delattr__' of 'object' objects>), ('__dict__', mappingproxy({'__weakref__': <attribute '__weakref__' of 'Foo' objects>, 'b': <function Foo.b at 0x10e2168c8>, '__module__': '__main__', '__doc__': None, '__dict__': <attribute '__dict__' of 'Foo' objects>, 'a': <function Foo.a at 0x10e216840>})), ('__dir__', <method '__dir__' of 'object' objects>), ('__doc__', None), ('__eq__', <slot wrapper '__eq__' of 'object' objects>), ('__format__', <method '__format__' of 'object' objects>), ('__ge__', <slot wrapper '__ge__' of 'object' objects>), ('__getattribute__', <slot wrapper '__getattribute__' of 'object' objects>), ('__gt__', <slot wrapper '__gt__' of 'object' objects>), ('__hash__', <slot wrapper '__hash__' of 'object' objects>), ('__init__', <slot wrapper '__init__' of 'object' objects>), ('__le__', <slot wrapper '__le__' of 'object' objects>), ('__lt__', <slot wrapper '__lt__' of 'object' objects>), ('__module__', '__main__'), ('__ne__', <slot wrapper '__ne__' of 'object' objects>), ('__new__', <built-in method __new__ of type object at 0x10df31e20>), ('__reduce__', <method '__reduce__' of 'object' objects>), ('__reduce_ex__', <method '__reduce_ex__' of 'object' objects>), ('__repr__', <slot wrapper '__repr__' of 'object' objects>), ('__setattr__', <slot wrapper '__setattr__' of 'object' objects>), ('__sizeof__', <method '__sizeof__' of 'object' objects>), ('__str__', <slot wrapper '__str__' of 'object' objects>), ('__subclasshook__', <built-in method __subclasshook__ of type object at 0x7fd4dad002f8>), ('__weakref__', <attribute '__weakref__' of 'Foo' objects>), ('a', <function Foo.a at 0x10e216840>), ('b', <function Foo.b at 0x10e2168c8>)]
>>> inspect.getmembers(Foo, predicate=inspect.ismethod)
[]