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class InstanceMethod(object):
"Like types.InstanceMethod, but with a reasonable (structural) equality."
def __init__(self, im_func, im_self, im_class):
self.im_func = im_func
self.im_self = im_self
self.im_class = im_class
def __call__(self, *args, **kwds):
firstarg = self.im_self
if firstarg is None:
if not args or not isinstance(args[0], self.im_class):
raise TypeError(
"must be called with %r instance as first argument" % (
self.im_class,))
firstarg = args[0]
args = args[1:]
return self.im_func(firstarg, *args, **kwds)
def __eq__(self, other):
return isinstance(other, InstanceMethod) and (
self.im_func == other.im_func and
self.im_self == other.im_self)
def __ne__(self, other):
return not self.__eq__(other)
def __hash__(self):
return hash((self.im_func, self.im_self))
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