[Tutor] introspection

[Joel Goldstick]

On Mon, Apr 20, 2015 at 11:24 AM, Alex Kleider <akleider at sonic.net> wrote:
> Does python provide the introspective ability to retrieve the name to which
> an object is bound?
>
> For example:
> $ python3
> Python 3.4.0 (default, Apr 11 2014, 13:05:18)
> [GCC 4.8.2] on linux
> Type "help", "copyright", "credits" or "license" for more information.
>>>>
>>>> a = 69
>>>> print("Identifier <{}> is bound to {}.".format(a.__name__, a))
>
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> AttributeError: 'int' object has no attribute '__name__'
>
>
An object can be bound to multiple names.  Within a namespace you can
use locals to see names, then compare various names like so:
>
>>> a = 3
>>> b = 6
>>> c = a
>>> locals()
{'a': 3, 'c': 3, 'b': 6, '__builtins__': <module '__builtin__'
(built-in)>, '__package__': None, '__name__': '__main__', '__doc__':
None}
>>> a is b
False
>>> a is c
True
>>>

>
>
> _______________________________________________
> Tutor maillist  -  Tutor at python.org
> To unsubscribe or change subscription options:
> https://mail.python.org/mailman/listinfo/tutor



-- 
Joel Goldstick
http://joelgoldstick.com