On 31.03.2016 23:08, Justin C. Walker wrote:
Hi, all,
I have couple of questions regarding "attributes" in Python/Sage:
1. If hasattr(X, "foo") returns True, does that mean that "X.foo" should not
blow up?
this means X.foo is defined.
2. Is there a way to tell, when hasattr(X, "foo") returns True, whether "X.foo"
can be called?
X.foo and x.foo.__call__ is None
3. If "X.foo" is callable, is it expected that "X.foo()" will *not* blow up with
"Not Implemented"?
No. For example you can have
class x(object):
def foo(self): raise NotImplemented()
x = new X()
x.foo() # this will raise a not implemented exception. but x.foo is well
defined.
bg,
Jo
I'm hoping that makes sense...
Thanks!
Justin
--
Justin C. Walker, Curmudgeon-At-Large, Director
Institute for the Enhancement of the Director's Income
--------
The path of least resistance:
it's not just for electricity any more.
--------
--
You received this message because you are subscribed to the Google Groups
"sage-devel" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to sage-devel+unsubscr...@googlegroups.com.
To post to this group, send email to sage-devel@googlegroups.com.
Visit this group at https://groups.google.com/group/sage-devel.
For more options, visit https://groups.google.com/d/optout.
