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headers Warren Weckesser | 1 May 2012 03:03

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Quick questions... if I use add_trait to add a number of traits with 
value to an instance of an object, how do I check those traits?
I've tried objectname.trait_get() and also objectname.get_trait(name).
I'll put a code snippet together asap.

Brennan

On 04/30/2012 02:57 PM, Robert Kern wrote:
>
> With a little bit of care, this can be made true. For example, main.py
> could use absolute imports, "from mypackage import foo". I recommend
> following through with my suggestions to see who is importing it and
> how. It is likely that you can just fix one of them. It's worth
> fixing, even if you do stop using the global variable.
>

I did a couple of more experiments and still no luck, I don't have time 
to investigate
now and anyway I would not like a solution that is not 100% reliable.

I think I'll change approach, so instead of trying to disable exception 
handling I'll just push
another exception handler, which will call exit when something is raised..

This is getting quite funny, there is absolutely no way that I can get 
the application to quit on exception apparently.
Now I commented out all our code to catch the exceptions and I did

def quit_on_error(object, trait_name, old_value, new_value):
     print("quitting because an exception was raised")
     exit(1)

push_exception_handler(quit_on_error, main=True, locked=True)

but nothing, I can still see the traceback in the shell but the 
application won't die..

On Tue, May 1, 2012 at 11:21 AM, Andrea Crotti
<andrea.crotti.0 <at> gmail.com> wrote:
> This is getting quite funny, there is absolutely no way that I can get the
> application to quit on exception apparently.
> Now I commented out all our code to catch the exceptions and I did
>
> def quit_on_error(object, trait_name, old_value, new_value):
>    print("quitting because an exception was raised")
>    exit(1)
>
> push_exception_handler(quit_on_error, main=True, locked=True)
>
> but nothing, I can still see the traceback in the shell but the application
> won't die..

Can you provide more information? What tracebacks are you seeing? Note
that these handlers are only for errors that are raised by trait
notification handlers, e.g. those that are raised inside
_<foo>_changed() methods. These exception handlers don't get called
for trait validation, for example. The GUI toolkits themselves
typically print-and-ignore exceptions that rise to the main event
loop. They do not stop the application.

--

-- 
Robert Kern
Enthought
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On Tue, May 1, 2012 at 10:09 AM, Brennan Williams
<brennan.williams@...> wrote:
> Quick questions... if I use add_trait to add a number of traits with
> value to an instance of an object, how do I check those traits?
> I've tried objectname.trait_get() and also objectname.get_trait(name).
> I'll put a code snippet together asap.

I'm not sure what you mean by "check those traits". You mean that you
want to see the TraitType that was added for that trait?

[~]
|1> from traits.api import *

[~]
|2> class A(HasTraits):
..>     pass
..>

[~]
|3> a = A()

[~]
|4> a.add_trait('x', Int(10))

[~]
|5> ct = a.trait('x')

[~]
|6> ct
<traits.traits.CTrait at 0x6a2f608>

[~]
|7> %see ct
    ()                    hash()                help()                repr()
    str()                 .cast()               .clone()
    .comparison_mode()    .default              .default_kind
    .default_value()      .default_value_for()  .delegate()
    .full_info()          .get_editor()         .get_help()
    .get_validate()       .handler()            .info()
    .inner_traits         .is_mapped()          .is_trait_type()
    .post_setattr         .post_setattr_original_value()
    .property()           .rich_comparison()    .set_validate()
    .setattr_original_value()                   .trait_type()         .type
    .validate()           .value_allowed()      .value_property()

[~]
|9> ct.trait_type
<traits.trait_types.Int at 0x6a28f30>

[~]
|10> ct.trait_type.default_value
10

--

-- 
Robert Kern
Enthought

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