On 30 Oct 2006 00:30:53 +0000, Jens Theisen <[EMAIL PROTECTED]> wrote:
>Hello,
>
>python uses gc only where refcounts alone haven't yet done the
>job. Thus, the following code
>
>class Foo:
> def __del__(self):
> print "deled!"
>
>def foo():
> f = Foo()
>
>foo()
>print "done!"
>
>prints
>
>deled!
>done!
>
>and not the other way round.
>
>In c++, this is a central technique used for all sorts of tasks,
>whereas in garbage collected languages it's usually not available.
>
>Is there a reason not to rely on this in Python? For example, are
>there alternative Python implementations that behave differently? Or
>some other subtle problems?
Among the numerous other reasons, there's this one:
Python 2.4.3 (#2, Oct 6 2006, 07:52:30)
[GCC 4.0.3 (Ubuntu 4.0.3-1ubuntu5)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> class Foo:
... def __del__(self):
... print 'collected'
...
>>> def foo():
... f = Foo()
... 1/0
...
>>> foo()
Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "<stdin>", line 3, in foo
ZeroDivisionError: integer division or modulo by zero
>>> print 'done!'
done!
>>> raise ValueError
collected
Traceback (most recent call last):
File "<stdin>", line 1, in ?
ValueError
>>>
>
>And some other minor question: Is there a way to query the use count
>of an object? This would be useful for debugging and testing.
Jean-Paul
--
http://mail.python.org/mailman/listinfo/python-list
