Viktor <[EMAIL PROTECTED]> wrote:
> Can somebody give me an explanation what happened here (or point me to
> some docs)?
>
> Code:
>
> HMMM = None
>
> def w(fn):
> print 'fn:', id(fn)
> HMMM = fn
> print 'HMMM:', id(HMMM)
> def wrapper(*v, **kw):
> fn(*v, **kw)
> wrapper.i = fn
> print 'wrapper:', id(wrapper)
> return wrapper
>
> class A:
> @w
> def __init__(self): pass
>
> print 'A.__init__:', id(A.__init__)
> print 'A.__init__.i:', id(A.__init__.i)
> print 'HMMM:', id(HMMM)
>
>
>
> Output:
>
> fn: 10404208
> HMMM: 10404208
> wrapper: 10404272
> A.__init__: 10376136
> A.__init__.i: 10404208
> HMMM: 505264624
>
>
>
> Why did HMMM changed his id?!
It didn't: global HMMM refers to None both before and after executing
the rest of your code. The other HMMM is local to a particular
invocation of w. Try the same steps interactively (and try printing the
values not just the ids) and it may be more obvious:
>>> HMMM = None
>>> print 'HMMM:', id(HMMM)
HMMM: 505264624
>>> def w(fn):
print 'fn:', id(fn)
HMMM = fn
print 'HMMM:', id(HMMM)
def wrapper(*v, **kw):
fn(*v, **kw)
wrapper.i = fn
print 'wrapper:', id(wrapper)
return wrapper
>>> class A:
@w
def __init__(self): pass
fn: 18299952
HMMM: 18299952
wrapper: 18300016
>>> print 'HMMM:', id(HMMM), HMMM
HMMM: 505264624 None
>>>
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