On Oct 15, 12:11 pm, Austin Bingham <austin.bing...@gmail.com> wrote:
> To put it in code, I want this:
>
> s = set(hash_func = lambda obj: hash(obj.name), eq_func = ...)
> ...
> x.name = 'foo'
> y.name = 'foo'
> s.add(x)
> s.add(y) # no-op because of uniqueness criteria
> assert len(s) == 1
I wrote a quick subclass of set that does something similar, but uses
just one function for the object uniqueness:
class MySet(set):
def __init__(self, iterable = (), idfunc = lambda x: x):
self.idfunc = idfunc
self.ids = set()
for item in iterable:
self.add(item)
def add(self, item):
id = self.idfunc(item)
if id not in self.ids:
self.ids.add(id)
set.add(self, item)
>>> class Foo(object):
... def __init__(self, name):
... self.name = name
...
>>> x = Foo('foo')
>>> y = Foo('foo')
>>> s = MySet(idfunc = lambda x: x.name)
>>> s.add(x)
>>> s
MySet([<__main__.Foo object at 0x00A89F90>])
>>> s.add(y)
>>> s
MySet([<__main__.Foo object at 0x00A89F90>])
Is this what you are looking for?
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