[Tutor] What's in a name?

[Keith Winston]

Thanks Walter, I think I've got the lay of the land roughly, but my grasp
is still light and imperfect. I'm pretty confident I shouldn't be doing
anything like what you're describing for the level of coding I'm doing, but
it's interesting to see the approach.

Keith



On Fri, Jan 3, 2014 at 6:56 PM, Walter Prins <wprins at gmail.com> wrote:

> Hi,
>
> The code in my last post got line wrapped which will break if directly
> tried out.  To avoid possible confusion I paste a version below with
> shorter lines which should avoid the problem:
>
>
> import gc, itertools
>
> def names_of(obj):
>     """Try to find the names associated to a given object."""
>     #Find dict objects from the garbage collector:
>     refs_dicts = (ref for ref in gc.get_referrers(obj)
>                   if isinstance(ref, dict))
>     #Get a single chained generator for all the iteritems() iterators
>     #in all the dicts
>     keyvalue_pairs = itertools.chain.from_iterable(
>                         refd.iteritems() for refd in refs_dicts)
>     #Return a list of keys (names) where the value (obj) is the one
>     #we're looking for:
>     return [k for k, v in keyvalue_pairs if v is obj]
>
> x = []
> y = x
> z = [x]
>
> print names_of(z[0])
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-- 
Keith
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