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Re: Dealing with exceptions

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From Ian Kelly <ian.g.kelly@gmail.com>
Date Sat, 2 Mar 2013 10:58:12 -0700
Subject Re: Dealing with exceptions
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On Sat, Mar 2, 2013 at 10:40 AM, bvdp <bob@mellowood.ca> wrote:
> Every time I write a program with exception handling (and I suppose that includes just about every program I write!) I need to scratch my brain when I create try blocks.
>
> For example, I'm writing a little program do copy specific files to a USB stick. To do the actual copy I'm using:
>
>     try:
>        shutil.copy(s, os.path.join(usbpath, songname))
>      except ...
>
> now, I need to figure out just what exceptions to handle. Let's see:
>
>   IOError  that means that the disk is full or otherwise buggered. Better dump out of the loop.
>
> But, I know there can be other errors as well. Doing some tests, I know that certain filenames are invalid (I think a "?" or unicode char is invalid when writing to a FAT32 filesystem). And, so what exception is that? Without actually creating the error, I can't figure it out.

OSError.  In Python 3, I expect it would more specifically be a
FileNotFoundError, which is a subclass of OSError.

> In this case, I can run the program an number of times and parse out the errors and write code to catch various things. But, I think I'm missing something completely. Guess what I'm looking for is a list of possible (probable?) errors for the shutil.copy() command. And, in a much bigger manual, for most other commands.

OSError will cover a wide swath of possible exceptions here.

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Thread

Dealing with exceptions bvdp <bob@mellowood.ca> - 2013-03-02 09:40 -0800
  Re: Dealing with exceptions Kwpolska <kwpolska@gmail.com> - 2013-03-02 18:52 +0100
    Re: Dealing with exceptions bvdp <bob@mellowood.ca> - 2013-03-02 11:35 -0800
      Re: Dealing with exceptions Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-03-03 01:41 +0000
    Re: Dealing with exceptions bvdp <bob@mellowood.ca> - 2013-03-02 11:35 -0800
    Re: Dealing with exceptions Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-03-03 00:41 +0000
      Re: Dealing with exceptions Chris Angelico <rosuav@gmail.com> - 2013-03-03 12:04 +1100
    Re: Dealing with exceptions Nobody <nobody@nowhere.com> - 2013-03-03 23:01 +0000
  Re: Dealing with exceptions Ian Kelly <ian.g.kelly@gmail.com> - 2013-03-02 10:58 -0700
  Re: Dealing with exceptions Ian Kelly <ian.g.kelly@gmail.com> - 2013-03-02 11:00 -0700
  Re: Dealing with exceptions Chris Angelico <rosuav@gmail.com> - 2013-03-03 05:21 +1100
    Re: Dealing with exceptions bvdp <bob@mellowood.ca> - 2013-03-02 11:39 -0800
    Re: Dealing with exceptions bvdp <bob@mellowood.ca> - 2013-03-02 11:39 -0800
  Re: Dealing with exceptions Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-03-02 19:18 +0000
  Re: Dealing with exceptions Devin Jeanpierre <jeanpierreda@gmail.com> - 2013-03-02 14:27 -0500
  Re: Dealing with exceptions Rick Johnson <rantingrickjohnson@gmail.com> - 2013-03-02 11:43 -0800
  Re: Dealing with exceptions Terry Reedy <tjreedy@udel.edu> - 2013-03-02 16:23 -0500
  Re: Dealing with exceptions Chris Angelico <rosuav@gmail.com> - 2013-03-03 09:16 +1100
  Re: Dealing with exceptions Terry Reedy <tjreedy@udel.edu> - 2013-03-02 18:08 -0500
  Re: Dealing with exceptions Chris Angelico <rosuav@gmail.com> - 2013-03-03 10:17 +1100

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