jojoba wrote:
> However, does it not seem reasonable to ask python:
>
> Given a dicitionary, Banana = {}
> return one or more strings,
> where each string is the name(s) of the reference(s) to Banana.
>
> why is this not sane?!?!
> what am i missing here?
Some time back I posted some code which would do exactly that, but it is
not nice, and it is buggy, but if you want to play with it:
http://groups.google.co.uk/group/comp.lang.python/tree/browse_frm/thread/394ba5b48f83ebfb/237dc92f3629dd9a
>>> import varname
>>> Banana = {}
>>> class C:
... classFruit = [{}, Banana]
...
>>> def names(x):
... for s in varname.object_info(x):
... print s
...
>>> names(Banana)
__main__.C.classFruit[1]
__main__.Banana
__main__.names()x
The problem as others have said is that there are a lot of namespaces in
Python (module globals, classes, instances, local variables of active
functions, ...), and the only way to find which names refers to an object
is to search the relevant namespaces.
There is some information which can help: for any object you can get a list
of all objects that refer to it, and that can be used to trace backwards
until you find a namespace at which point you still have to search the
namespace to find out which name refers to the object. Of course doing all
this creates lots of new references and infinite loops both of which you
have to ignore.
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