On 4/24/2011 5:21 PM, Ken Seehart wrote:
Good point, Benjamin. I didn't think of testing on Jython before
answering. For practical purposes it's a really good idea to test
obscure features against all potential target platforms.
In this case, I would argue that**Benjamin's test demonstrates a bug in
Jython.
Benjamin's 'test' only tested that he could add a new attribute to a
function object, as he did not use the proper 2.x name, func_defaults.
One could counter by pointing out that the documentation does not
specify that the __defaults__ attribute is writable.
The 3.x docs, as another pointed out, does so specify. The same was true
in 2.x at least by 2.5
http://docs.python.org/release/2.5.4/ref/types.html
"func_defaults A tuple containing default argument values for those
arguments that have defaults, or None if no arguments have a default
value Writable"
So if the following does not work in Jython 2.5
def f(a=42) :
return a
f()
# 42
f.func_defaults = (23,)
f()
# 23
then it *does* have a bug with respect to matching the Python 2.5 spec.
--
Terry Jan Reedy
--
http://mail.python.org/mailman/listinfo/python-list
