Dethe- Thanks; that was very helpful in improving my understanding of Python in practice.
--Paul Fernhout Dethe Elza wrote: > Paul, > > to assign a function to an instance object (rather than a class) as a > new method, use the "new" module: > > ===== start module prototype.py ====== > > > ''' > Example of adding methods to an instance object and a class > ''' > > import new > > class Foo(object): > > def bar(self): > print 'bar', self.__class__ > > > # outside of class Foo, define some functions to turn into methods: > > def baz(self): > print 'baz', self.__class__ > > def foobar(self): > print 'foobar', self.__class__ > > # make some instances > > a = Foo() > b = Foo() > > # make baz a method of Foo, both a and b should be able to call it > > Foo.baz = baz > > print 'baz:', Foo.baz > > a.baz() > b.baz() > > # make foobar a method of a, calling b.foobar should fail > > a.foobar = new.instancemethod(foobar, a, a.__class__) > > print 'foobar:', a.foobar > > a.foobar() > b.foobar() # fails > > ===== end of module ====== > > and when you run it: > > $ python prototype_based.py > baz: <unbound method Foo.baz> > baz <class '__main__.Foo'> > baz <class '__main__.Foo'> > foobar: <bound method Foo.foobar of <__main__.Foo object at 0x75990>> > foobar <class '__main__.Foo'> > Traceback (most recent call last): > File "prototype_based.py", line 42, in <module> > b.foobar() # fails > AttributeError: 'Foo' object has no attribute 'foobar' > > > More info: http://docs.python.org/lib/module-new.html > > HTH > > --Dethe > > _______________________________________________ Edu-sig mailing list Edu-sig@python.org http://mail.python.org/mailman/listinfo/edu-sig
