Chris Rebert wrote:
> Although I have no idea how it is that `id({}) == id({})` as a prior
> posted showed; FWIW, I can't manage to reproduce that outcome.
Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> id({})== id({})
True
It's believable if id({}) does the following:
1. Construct an empty dict
2. Take the id of the dict
3. Reduce the reference-count on the now-unneeded dict.
It's not too hard for the second empty dict to get allocated in the same
memory that the first one (now dereferenced and deallocated) used, so
CPython gives it the same id value.
When the == comparison happens, all it needs are the two ints returned from
the id calls.
Mel.
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