Whre is my object ??

[Erik Max Francis]

King Kuta wrote:

> Ok, a little riddle for he Python community.
> 
> Follow this code (interactive):
> 
> >>> class marco:
> ...     pass
> ...
> >>> objlist[0]=marco
> >>> del marco

You delete the original name.

"C:\PROGRA~1\PYTHON~1.2\Lib\site-packages\wxPython\tools\boa\ExternalLi
> b\Pyt
> honInterpreter.py", line 69, in push
>     exec code in self.locals
>   File "<console>", line 1, in ?
> '''exceptions.NameError : name 'marco' is not defined'''

So it's not surprising that it's deleted.

> So where is my object? (apart from the obvious mem location at
> 0x023824D8)

It's in objectlist[0], right where you put it.  In Python, variables
aren't really unique objects themselves, they're just bindings (def and
class statements really just construct the relevant function/class
objects and bind them to the provided name; there's nothing inherently
special about function/class names).  The object is the thing that's
unique, not the variable.

>>> a = object() # just some unique object, doesn't matter what
>>> a
<object object at 0x81175b8>
>>> b = a # now a and b are both bound to the same thing
>>> del a # now destroy the a binding
>>> b # now b references what was once referenced by a
<object object at 0x81175b8>
>>> a # and a is gone
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
NameError: name 'a' is not defined

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