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To clarify the current state of this:
- I'm still in favour of adding this feature for Python 3.4
- a suitable patch is still needed, as the currently attached patches modify the existing functools.partial object, rather than adding a separate "partialmethod" API
- a Python implementation would be fine
The following prototype should work as a starting point to be elaborated into a full patch with docs and tests:
class partialmethod(functools.partial):
 def __get__(self, obj, cls):
 if obj is None:
 return self
 return functools.partial(self.func,
 *((obj,) + self.args),
 **self.keywords)
 def __call__(*args, **kwds):
 self, *args = args
 call_kwds = {}
 call_kwds.update(self.keywords)
 call_kwds.update(kwds)
 return self.func(self,
 *(self.args + args),
 **call_kwds)
class C:
 def example(self, *args, **kwds):
 print(self, args, kwds)
 fails = functools.partial(example, 1, 2, 3, x=1)
 works = partialmethod(example, 1, 2, 3, x=1)
>>> C().fails()
1 (2, 3) {'x': 1}
>>> C().works()
<__main__.C object at 0x7f91cefeea90> (1, 2, 3) {'x': 1}
>>> C().fails(4, 5, 6)
1 (2, 3, 4, 5, 6) {'x': 1}
>>> C().works(4, 5, 6)
<__main__.C object at 0x7f91cefeea10> (1, 2, 3, 4, 5, 6) {'x': 1}