Re: Understanding and dealing with an exception

Discussion in 'Python' started by Mark Lawrence, Oct 14, 2012.

  1. On 14/10/2012 11:06, Terry Reedy wrote:
    > On 10/14/2012 4:20 AM, Mark Lawrence wrote:
    >
    >> You've already had some advice so I'll just point out that a bare except
    >> is a bad idea as you wouldn't even be able to catch a user interrupt.
    >> Try (groan!) catching StandardError instead.

    >
    > There are some bare except:s in the stdlib, that adding another is
    > frowned on and removing one is smiled upon.
    >
    > However:
    > >>> StandardError

    > Traceback (most recent call last):
    > File "<pyshell#0>", line 1, in <module>
    > StandardError
    > NameError: name 'StandardError' is not defined
    >
    > Try:
    > >>> Exception

    > <class 'Exception'>
    >
    > This catches everything except a few things like Keyboard Interrupt that
    > you normally should not catch.
    >
    > >>> BaseException

    > <class 'BaseException'>
    >
    > This catches everything, but signals that doing so is probably intentional.
    >


    White Man type with forked fingers?

    c:\Users\Mark\Cash\Python>python
    Python 2.7.3 (default, Apr 10 2012, 23:31:26) [MSC v.1500 32 bit
    (Intel)] on win32
    Type "help", "copyright", "credits" or "license" for more information.
    >>> StandardError

    <type 'exceptions.StandardError'>

    Perhaps not.

    c:\Users\Mark\Cash\Python>py -3
    Python 3.3.0 (v3.3.0:bd8afb90ebf2, Sep 29 2012, 10:55:48) [MSC v.1600 32
    bit (Intel)] on win32
    Type "help", "copyright", "credits" or "license" for more information.
    >>> StandardError

    Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
    NameError: name 'StandardError' is not defined

    Down to this http://www.python.org/dev/peps/pep-3151/ or was it done
    earlier?

    --
    Cheers.

    Mark Lawrence.
    Mark Lawrence, Oct 14, 2012
    #1
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