On Thu, 12 Mar 2020 at 23:55, Andrew Barnert
<[email protected]> wrote:
> Because Julian’s patch has nothing to do with discarding the temporary
> references. It has to do with knowing that an array is safe to reuse.
Sorry, but I do not understand. Are you saying that the patch does not
create a new temporary ndarray, but modifies in-place the old
temporary ndarray? And that he knows that is temporary because
refcount is 1?
Anyway, I modified a little the Chris' code
class Thing:
def __init__(self, name):
self.name = name
print("Creating", self)
def __repr__(self):
return f"{self.__class__.__name__}({self.name})"
def __add__(self, other):
return self.__class__(self.name + other.name)
def __del__(self):
print("Deleting", self, " - ID:", id(self))
a = Thing("a")
b = Thing("b")
c = Thing("c")
d = Thing("d")
print("######## Before statement")
z = a + b + c + d
print("######## After statement")
Result:
Creating Thing(a)
Creating Thing(b)
Creating Thing(c)
Creating Thing(d)
######## Before statement
Creating Thing(ab)
Creating Thing(abc)
Deleting Thing(ab) - ID: 140185716001088
Creating Thing(abcd)
Deleting Thing(abc) - ID: 140185715998976
######## After statement
Deleting Thing(a) - ID: 140185717096992
Deleting Thing(b) - ID: 140185717130192
Deleting Thing(c) - ID: 140185717176784
Deleting Thing(d) - ID: 140185715998880
Deleting Thing(abcd) - ID: 140185716001088
As you can see, Thing(abcd) has the same id of Thing(ab). So what Eric
Wieser wanted is already implemented in Python, for temporary objects.
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