Python build-in exceptions - how to get exception fields

Question

I have the following error message:

type object 'SomeClass' has no attribute 'some_class_field'

The exception is of type 'AtrributeError'.

Is there any way to change the error message to:

Provider class 'SomeClass' has no field 'some_class_field'

I guess those parameters are saved in the python exception class and I think there could be a solution of the following type:

try:
    # some code
except AtrributeError as ae:
    print("Provider class '{0}' has no field '{1}'").format(ae.type_object, ae.attribute))
    exit(1)

you can always extract the values from the exception object. Why do you need to customize the message like this, though? — Dimitris Fasarakis Hilliard
– Dimitris Fasarakis Hilliard, Commented May 25, 2017 at 11:50
@Jim Fasarakis Hilliard I was wondering if it could happen whithout defining my own exceptions, that is why I asked. Also I thought it would be better more understandable for people that don't write in python. — stefan.stt
– stefan.stt, Commented May 25, 2017 at 11:56
Don't define your own exceptions; get the exception message from ae.args[0] and extract the parts you need. Then print them out (using .format or whatever else you need). — Dimitris Fasarakis Hilliard
– Dimitris Fasarakis Hilliard, Commented May 25, 2017 at 11:58

Dinesh undefined · Accepted Answer · 2017-05-25 12:44:08Z

1

simply You cant do that.

if you do like that again you will exception like this

    print("Provider class '{0}' has no field '{1}'").format(ae.type_object, ae.attribute)
AttributeError: 'exceptions.AttributeError' object has no attribute 'type_object'

from Jim Fasarakis Hilliard comment:

we can't access like that because ae has only message key. it doesn't have any other key for what you are trying to access. Don't define your own exceptions; get the exception message from ae.args[0] and extract the parts you need. Then print them out (using .format or whatever else you need). – Jim Fasarakis Hilliard

edited May 25, 2017 at 12:44

answered May 25, 2017 at 11:37

Dinesh undefined

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2 Comments

stefan.stt Over a year ago

Please add the idea of the Jim Fasarakis Hilliard comments as a short explanatory text and I will accept your answer. This is for more comprehensive closure of the topic, thank you in advance.

Dinesh undefined Over a year ago

@stefan.stt thank you. i update my answer. please check

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