The “correct” way to define an exception in Python without PyLint complaining

Question

I\'m trying to define my own (very simple) exception class in Python 2.6, but no matter how I do it I get some warning.

First, the simplest way:

class My         


        

Answer 1

Your first way should work. I use it myself all the time in Python 2.6.5. I don't use the "message" attribute, however; maybe that's why you're getting a runtime warning in the first example.

The following code, for example, runs without any errors or runtime warnings:

class MyException(Exception):
    pass

def thrower():
    error_value = 3
    raise MyException("My message", error_value)
    return 4

def catcher():
    try:
        print thrower()
    except MyException as (message, error_value):
        print message, "error value:", error_value

The result:

>>> catcher()
My message error value: 3

I don't know if PyLint would have a problem with the above.