Re: Merging Objects
Cloudthunder wrote: > Sorry, I don't understand, how does this solve my problem? > __getattr__ and __setattr__ allow you to set up dynamic delegation e.g., class Foo(object): def __init__(self, **kw): self.__dict__.update(kw) def methFoo(self, x): return "Foo.methFoo(%s,%s)" % (self,x) class Bar(object): def __init__(self, **kw): self.__dict__.update(kw) def methBar(self, x): return "Foo.methFoo(%s,%s)" % (self,x) class MultiDelegate(object): def __init__(self, *args): object.__setattr__(self,"_objects",args) def __getattr__(self, attr): for obj in self._objects: if attr in dir(obj): return getattr(obj, attr) types = ",".join(obj.__class__.__name__ for obj in self._objects) raise AttributeError, "%s object has no attribute '%s'" % (types, attr) def __setattr__(self, attr, value): # but you could do something more useful here too raise TypeError, "Can't set attributes of MultiDelegate" >>> f = Foo(a=1) >>> b = Bar(b=2) >>> m = MultiDelegate(f,b) >>> m.a 1 >>> m.b 2 >>> m.methFoo(1) 'Foo.methFoo(,1)' >>> m.methBar(1) 'Foo.methFoo(,1)' >>> HTH Michael -- http://mail.python.org/mailman/listinfo/python-list
Re: Merging Objects
Sorry, I don't understand, how does this solve my problem?On 4/3/06, Jesus Rivero - (Neurogeek) <[EMAIL PROTECTED] > wrote:-BEGIN PGP SIGNED MESSAGE-Hash: SHA1>>> help(getattr) help(setattr) Regards, Jesus Rivero - (Neurogeek)Cloudthunder wrote:> Question: how do I merge two objects? I would like to be able to> have an instance of Foo and an instance of Boo and then be able to > add them together and create a new object that has the methods and> properties of both objects. I am going to be doing a lot of this> and I don't want to have to dynamically (or otherwise) create a > whole bunch of classes that inherit from both Foo and Boo then> create instances of those new children classes. In fact, this> wouldn't work for me anyway because I am going to have an instance> of Foo which will be used within my algorithm for sometime then > later I will want to merge it with a fresh instance of Boo or> otherwise give it all the methods and properties of the Boo class.> Am I making any sense here?>> Thanks.>> - OP >> P.S. I also noticed that we can no long use the __members__> property to get a tuple of all a class's methods. How can I get the> same info from dir()? Dir(), I understand, tells you about all > properties and you can't tell it to just list the methods.-BEGIN PGP SIGNATURE-Version: GnuPG v1.4.1 (GNU/Linux)Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.orgiD8DBQFEMWPzdIssYB9vBoMRAnkLAJ4mkUTlB9POlOyE5MeHukAJ5LeawQCghtoQDsn33bw0LYFsNS2AYStPLdU==Dt4g-END PGP SIGNATURE- -- http://mail.python.org/mailman/listinfo/python-list
Re: Merging Objects
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 >>> help(getattr) help(setattr) Regards, Jesus Rivero - (Neurogeek) Cloudthunder wrote: > Question: how do I merge two objects? I would like to be able to > have an instance of Foo and an instance of Boo and then be able to > add them together and create a new object that has the methods and > properties of both objects. I am going to be doing a lot of this > and I don't want to have to dynamically (or otherwise) create a > whole bunch of classes that inherit from both Foo and Boo then > create instances of those new children classes. In fact, this > wouldn't work for me anyway because I am going to have an instance > of Foo which will be used within my algorithm for sometime then > later I will want to merge it with a fresh instance of Boo or > otherwise give it all the methods and properties of the Boo class. > Am I making any sense here? > > Thanks. > > - OP > > P.S. I also noticed that we can no long use the __members__ > property to get a tuple of all a class's methods. How can I get the > same info from dir()? Dir(), I understand, tells you about all > properties and you can't tell it to just list the methods. -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.1 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFEMWPzdIssYB9vBoMRAnkLAJ4mkUTlB9POlOyE5MeHukAJ5LeawQCghtoQ Dsn33bw0LYFsNS2AYStPLdU= =Dt4g -END PGP SIGNATURE- -- http://mail.python.org/mailman/listinfo/python-list
Merging Objects
Question: how do I merge two objects? I would like to be able to have an instance of Foo and an instance of Boo and then be able to add them together and create a new object that has the methods and properties of both objects. I am going to be doing a lot of this and I don't want to have to dynamically (or otherwise) create a whole bunch of classes that inherit from both Foo and Boo then create instances of those new children classes. In fact, this wouldn't work for me anyway because I am going to have an instance of Foo which will be used within my algorithm for sometime then later I will want to merge it with a fresh instance of Boo or otherwise give it all the methods and properties of the Boo class. Am I making any sense here? Thanks. - OPP.S. I also noticed that we can no long use the __members__ property to get a tuple of all a class's methods. How can I get the same info from dir()? Dir(), I understand, tells you about all properties and you can't tell it to just list the methods. -- http://mail.python.org/mailman/listinfo/python-list
