Set a flag on the function or a global?

[Steven D'Aprano]

On Tuesday 16 June 2015 10:24, Ron Adam wrote:

> Another way is to make it an object with a __call__ method.
> 
> The the attribute can be accessed from both outside and inside dependably.

That's what functions are, objects with a __call__ method:


py> (lambda: None).__call__
<method-wrapper '__call__' of function object at 0xb7301a04>


One slight disadvantage is that functions don't take a "self" parameter by 
default, which means they have to refer to themselves by name:

def spam():
    print spam.attr


Here's a fun hack:

py> from types import MethodType
py> def physician(func):
...     # As in, "Physician, Know Thyself" :-)
...     return MethodType(func, func)
... 
py> @physician
... def spam(this, n):
...     return this.food * n
... 
py> spam.__func__.food = "spam-and-eggs "
py> spam(3)
'spam-and-eggs spam-and-eggs spam-and-eggs '


Alas, you cannot write directly to the method object itself :-(



-- 
Steve