alon horev added the comment:
I think the following test demonstrates the API we're looking for.
1. Am I missing any functionality?
2. How does partialmethod relate to @absolutemethod?
from functools import partial
class partialmethod(object):
def __init__(self, func, *args, **keywords):
# func could be a descriptor like classmethod which isn't callable,
# so we can't inherit from partial (it verifies func is callable)
if isinstance(func, partialmethod):
# flattening is mandatory in order to place cls/self before all
other arguments
# it's also more efficient since only one function will be called
self.func = func.func
self.args = func.args + args
self.keywords = {}
self.keywords.update(func.keywords)
self.keywords.update(keywords)
else:
self.func = func
self.args = args
self.keywords = keywords
def _make_unbound_method(self):
def _method(*args, **keywords):
keywords.update(self.keywords)
cls_or_self, *rest = args
call_args = (cls_or_self,) + self.args + tuple(rest)
return self.func(*call_args, **keywords)
return _method
def __get__(self, obj, cls):
get = getattr(self.func, "__get__", None)
if get is None:
if obj is None:
return self._make_unbound_method()
return partial(self._make_unbound_method(), obj) # returns a bound
method
else:
callable = get(obj, cls)
if callable is self.func:
return self._make_unbound_method()
return partial(callable, *self.args, **self.keywords)
class A(object):
def add(self, x, y):
return self, x + y
add10 = partialmethod(add, 10)
add10class = partialmethod(classmethod(add), 10)
add10static = partialmethod(staticmethod(add), 'self', 10)
return15 = partialmethod(add10, 5) # nested partialmethod
add2partial = partial(add, x=2)
return12 = partialmethod(add2partial, y=10) # partialmethod over partial
def test():
cls = A
instance = cls()
assert instance.add10class(5) == (cls, 15)
assert cls.add10class(5) == (cls, 15)
assert instance.add10static(5) == ('self', 15)
assert cls.add10static(5) == ('self', 15)
assert instance.add10(5) == (instance, 15)
assert cls.add10(instance, 5) == (instance, 15)
assert instance.return15() == (instance, 15)
assert cls.return15(instance) == (instance, 15)
assert instance.return12() == (instance, 12)
assert cls.return12(instance) == (instance, 12)
test()
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue4331>
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