[Python-ideas] Allow function __globals__ to be arbitrary mapping not just dict

[Steven D'Aprano]

On Sun, Mar 18, 2012 at 11:27:09PM +1100, Steven D'Aprano wrote:

> I propose to allow function.__globals__ to accept any mapping type.

Jython already supports this behaviour.

steve at runes:~$ jython
[...]
Jython 2.5.1+ (Release_2_5_1, Aug 4 2010, 07:18:19) 
[OpenJDK Client VM (Sun Microsystems Inc.)] on java1.6.0_18
Type "help", "copyright", "credits" or "license" for more information.
>>> 
>>> class Mapping:
...     def __getitem__(self, key):
...             if key == 'a': return 1
...             else: raise KeyError(key)
... 
>>> from types import FunctionType
>>> f = lambda x: x + a
>>> g = FunctionType(f.func_code, Mapping(), 'g')
>>> g(2)
3


-- 
Steven