En Thu, 11 Feb 2010 00:25:00 -0300, Terry Reedy <tjre...@udel.edu>
escribió:
On 2/10/2010 4:49 PM, Gabriel Genellina wrote:
I've written a decorator for "injecting" a __function__ name into the
function namespace, but I can't find it anywhere. I think I implemented
it by adding a fake additional argument and replacing LOAD_GLOBAL with
LOAD_NAME in the bytecode.
The decorator only needs to replace the defaults args tuple.
It does not even need to know the parameter name,
just that it is the only (or last) with a default .
def f(n, me=None):
if n > 0: return n*me(n-1)
elif n==0: return 1
f.__defaults__ = (f,) # 3.1
print(f(5))
This is simple to implement, but requires changing the function
definition. My goal was to keep the original code unchanged, that is,
leave it as:
def f(n):
if n > 0: return n*f(n-1)
elif n==0: return 1
(like a normal, recursive function), and make the 'f' inside the function
body "magically" refer to the function itself.
Of course, user could still screw up recursion by providing another
value for 'me'. This strikes me as about a likely (low) as a user
screwing up recursion in a library module function by rebinding the name
in the imported module.
Well, if people really want to shoot themselves in the foot, there's
nothing we can do to avoid that...
--
Gabriel Genellina
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