On 6 April 2013 03:40, candide <c.cand...@laposte.net> wrote: > Le vendredi 5 avril 2013 16:53:55 UTC+2, Arnaud Delobelle a écrit : > > > > > > You've fallen victim to the fact that CPython is very quick to collect > > > > garbage. > > > OK, I get it but it's a fairly unexpected behavior. > Thanks for the demonstrative snippet of code and the instructive answer. >
If you read the docs for id() < http://docs.python.org/3.3/library/functions.html#id>, you will see that it says: Return the "identity" of an object. This is an integer which is guaranteed to be unique and constant for this object during its lifetime. Two objects with non-overlapping lifetimes may have the same id() value. If you think it could explain things better, please submit a doc bug. I think part of your confusion here is that bound methods in Python are created when accessed. So A.f and a.f are not the same object - one is a function (an unbound method, but there's no distinction in Python 3.x) and the other is a bound method. For that reason, accessing a.f twice will return two different bound method instances. Python 3.3.0 (v3.3.0:bd8afb90ebf2, Sep 29 2012, 10:57:17) [MSC v.1600 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> class A(object): ... def f(self): ... print("A") ... >>> a=A() >>> print(id(a.f) == id(a.f), a.f is a.f) True False >>> Tim Delaney
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