On Thu, Mar 31, 2016 at 2:08 PM, Justin C. Walker <jus...@mac.com> 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?
What's the definition of "blow up"? I think X.foo could -- due to
Python "properties" -- run arbitrary Python code, e.g., to launch a
missile (or raise an exception).
>
> 2. Is there a way to tell, when hasattr(X, "foo") returns True, whether
> "X.foo" can be called?
>
> 3. If "X.foo" is callable, is it expected that "X.foo()" will *not* blow up
> with "Not Implemented"?
Not necessarily.
try:
X.foo()
except (NotImplementedError, AttributeError):
....
>
> 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.
> --------
>
>
>
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--
William (http://wstein.org)
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