Exec and Scope

[Rafe]

On Oct 31, 10:47 am, "Emanuele D'Arrigo" <man... at gmail.com> wrote:
> Hi everybody!
>
> I'm trying to do something in a way that is probably not particularly
> wise but at this point I don't know any better, so bear with me.
>
> Suppose in main.py I have the following statements:
>
> myObject = MyObject()
> execThis("myObject.myCommand()")
>
> Now suppose the method
>
> def execThis(aCommandInAString):
>     exec(aCommandInAString)
>
> is somewhere "far away" in terms of scope. Somewhere where the code
> doesn't know anything about the instance myObject and even less about
> its methods and attributes. How do I get myObject.myCommand() properly
> executed?
>
> I'm guessing it's about taking a snapshot of or a reference to the
> namespace that is correct for the execution of the command, but... is
> that the case? And how do I get a handle to that?
>
> Thanks for your help!
>
> Manu

If you are just looking to execute an attribute (be it a property,
module-level function, instance or class method, or anything else
which is an attribute of an object), just use getattr().

Execute a 'method' (which is just a callable object right?) of an
instance of MyObject named "myCommand":

>>> class MyObject(object):
...    def my_command(self):
...        print "hello"
...
>>> myObject = MyObject()
>>> attr = getattr(myObject, "my_command")
>>> attr()
hello


- Rafe