On 9 July 2012 09:28, Calvin Spealman <ironfroggy@gmail.com> wrote:
On Sun, Jul 8, 2012 at 4:22 PM, Mike Graham <mikegraham@gmail.com> wrote:
A common stumbling block for new users is writing decorators that take arguments. To create a decorator like
@timesn(n) def f(y): ...
-1 for the new syntax, since a decorator for trivial decorator factories (rather, parameterized decorators) can be written in a total of 5 lines: from functools import partial def parameterized(decorator): def part_decorator(*args, **kw): return partial(decorator, *args, **kw) return part_decorator
@parameterized ... def times(n, func): ... def new_func(*args, **kw): ... return n * func(*args, **kw) ... return new_func ...
@times(3) ... def add(x ,y): ... return x + y ... add(1,1) 6
For more complex cases, requiring pre processing, post processing, and so on, the normal syntax can cut it. And, certainly, a more complex such decorator could be written, so that it accepts some arguments itself. (I would be +1 for such a decorator in functools) js -><-