On 5/27/06, Steve Holden <
[EMAIL PROTECTED]> wrote:
Cloudthunder wrote:
> In the example:
>
> class Boo:
> def __init__(self, parent):
> self.parent = parent
> print self.parent.testme
> def run():
> print "Yahooooo!"
>
> class Foo:
> testme = "I love you!"
> def __init__(self):
> test = Boo(self)
>
> A = Foo()
>
>
> How can I set up method delegation so that I can do the following:
>
> A.run()
>
> and have this call refer to the run() method within the boo instance?
> Also, what if I have tons of functions like run() within the boo
> instance and I want all them to be directly accessible as if they were
> part of their parent (the Foo instance)?
>
The usual way is to provide a __getattr__ method, since this is invoked
after the usual mechanisms have failed to produce a sought attribute.
class Boo:
def run(self):
print "Yahooooo!"
def identify(self):
print repr(self)
class Foo:
testme = "I love you!"
def __init__(self):
self.test = Boo()
def __getattr__(self, attname):
return getattr(self.test, attname)
A = Foo()
B = Boo()
B.run()
B.identify()
A.run()
A.identify()
[EMAIL PROTECTED] ~/Projects/Python
$ python test49.py
Yahooooo!
<__main__.Boo instance at 0x186c002c>
Yahooooo!
<__main__.Boo instance at 0x186b9d4c>
regards
Steve
--
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