On 24-Apr-11 13:07 PM, Ken Seehart wrote:
On 4/24/2011 2:58 AM, Steven D'Aprano wrote:
Consider this in Python 3.1:
def f(a=42):
... return a
...
f()
42
f.__defaults__ = (23,)
f()
23
Is this an accident of implementation, or can I trust that changing
function defaults in this fashion is guaranteed to work?
This is documented in python 3, so I would expect it to be stable (until
python 4, that is)
http://docs.python.org/py3k/whatsnew/3.0.html#operators-and-special-methods
http://docs.python.org/py3k/library/inspect.html#types-and-members
The f.__defaults__ attribute was previously known as f.func_defaults (in
python 2.x), which has been around, documented and stable for quite a
while.
So it's probably just as safe as any other monkey patching technique. :)
Best of luck,
Ken
Wouldn't it make more sense to return a dictionary instead of a tuple?
Colin W.
--
http://mail.python.org/mailman/listinfo/python-list
