[EMAIL PROTECTED] a écrit :
> Hallo,
> playing with the decorators from PEP 318 I found the elegant singleton
> decorator.
>
> def singleton(cls):
> instances = {}
> def getinstance():
> if cls not in instances:
> instances[cls] = cls()
> return instances[cls]
> return getinstance
>
> @singleton
> class A: pass
>
(snip)
> But I always get a syntax error declaring class A as singleton.
>
>>>> reload ( decorator)
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> File "decorator.py", line 27
> class A: pass
> ^
> SyntaxError: invalid syntax
>
> What's the problem with this code because it's only copied for the PEP
> 318?
> It doesn't work with python 2.4 and python 2.5.
A pep is a proposal, not a feature documentation. As written in pep318,
class decorators have not been implemented so far. They'll be
implemented in 2.6 (more exactly: they are implemented in 2.6, but 2.6
is still alpha so far).
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