On Mon, 01 Jul 2013 20:36:29 +0100, Marcin Szamotulski wrote:
> Here is another example which I came across when playing with
> generators, the first function is actually quite useful, the second
> generator is the whole fun:
>
> from functools import wraps
> def init(func):
> """decorator which initialises the generator """
> @wraps(func)
> def inner(*args, **kwargs):
> g = func(*args, **kwargs)
> g.send(None)
> return g
> return inner
>
> @init
> def gen(func):
> x = (yield)
> while True:
> x = (yield func(x))
>
>
> now if you have function f
> def f(arg):
> return arg**2
>
> then calling f(5) is the same as
>
> g = gen(f)
> g.send(5)
I think you must be missing an important part of the trick, because
calling f(5) returns 25. It's not:
@gen
def f(arg):
return arg**2
because that raises TypeError.
--
Steven
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