On 17/06/17 23:27, Mital Ashok via Python-ideas wrote:
[snip] So I'm suggesting that @function.register for single dispatch functions returns the same function, so you would end up with something like:
@singledispatch def fun(arg, verbose=True): if verbose: print("Let me just say,", end=" ") print(arg)
@fun.register(int) def fun(arg, verbose=True): if verbose: print("Strength in numbers, eh?", end=" ") print(arg)
In principle, I like it! However...
And to get back the old behaviour, where you can get the function being decorated, just call it afterwards:
A backwards incompatible change like this is not going to happen.
In actual fact, a couple of uses of the current behaviour are in the docs at https://docs.python.org/3/library/functools.html#functools.singledispatch :
The register() attribute returns the undecorated function which enables decorator stacking, pickling, as well as creating unit tests for each variant independently:
@fun.register(float)
... @fun.register(Decimal) ... def fun_num(arg, verbose=False): ... if verbose: ... print("Half of your number:", end=" ") ... print(arg / 2) ...
fun_num is fun
False
Perhaps it makes sense to add a new method to singledispatch that has the behaviour you're suggesting, just with a different name?
-- Thomas