Add methods to a class at runtime?

[Robert Oschler]

"Gerhard Häring" <gerhard.haering at gmx.de> wrote in message
news:slrnan4dl3.18h.gerhard.haering at lilith.my-fqdn.de...
> >>> class Foo: pass
> ...
> >>> foo = Foo()
> >>> foo.bar()
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> AttributeError: Foo instance has no attribute 'bar'
> >>> def bar(self): print "bar"
> ...
> >>> Foo.bar = bar
> >>> foo.bar()
> bar
> >>>

Gerhard,

Thanks but I need a little bit more detail.  Suppose I want to do it from
within code?  For example, I create a function called
AddBarToFoo(FooObject), that given a object of type Foo (FooObject) adds the
Bar method to it dynamically, what would be the syntax then?  Would I have
to put the method declaration code, which you show being typed in to the
interpreter, in a string and then eval/exec it?  Is there a more convenient
way than that?

thx