Hi Mike,
Thanks for the explanation! The Python shell really threw me off here.
I thought it would work exactly the same as in the interpreter itself.
:-)
Even assigning None to the object exibits the same behaviour as "del"
does. COOL!
This is what I did sofar:
from pydispatch import dispatcher
class X(object):
def __init__(self):
dispatcher.connect(self.someSignal, signal = 1)
def someSignal(self):
print 'Hello world'
a = X()
dispatcher.send(1)
a = None
dispatcher.send(1)
print '----------------------'
b = X()
c = X()
dispatcher.send(1)
With as output;
C:\Documents and Settings\Jorg\Desktop>python New1.py
Hello world
----------------------
Hello world
Hello world
Nice! Thanks a lot for the info!
- Jorgen
On 4/5/07, Mike C. Fletcher <[EMAIL PROTECTED]> wrote:
> Jorgen Bodde wrote:
> > Hi all,
> >
> > Hopefully someone can help me. I am fairly new to Python, and I am
> > looking into PyDispatcher. I am familiar with the C++ sigslot variant,
> > and I wonder how similar PyDispatches is. I run in to the following
> > 'problem' (pseudo code, untested here)
> >
> Here's some real code...
>
> from pydispatch import dispatcher
> import gc
>
> class X(object):
> def __init__( self ):
> dispatcher.connect( self.someSignal, signal=1 )
> def someSignal( self ):
> print 'hello world'
>
> obj = X()
> dispatcher.send( signal= 1 )
>
> del obj
> #gc.collect()
>
> dispatcher.send( signal= 1 )
>
> This will print out only one "hello world" on my Python 2.5 Gentoo
> machine (it should work the same on any recent Python). Basically your
> python shell will tend to keep around an extra copy of the X instance
> until you get rid of it explicitly, and that's what keeps the object
> "live" and receiving signals if you try the code in the shell.
> PyDispatcher is designed so that, by default, when the object goes away
> the registration is removed. It uses the weakref module to do this,
> rather than __del__ methods, to avoid garbage cycles, btw.
>
> HTH,
> Mike
>
> --
> ________________________________________________
> Mike C. Fletcher
> Designer, VR Plumber, Coder
> http://www.vrplumber.com
> http://blog.vrplumber.com
>
>
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