On 02/03/2013 17:58, Ian Kelly wrote:
On Sat, Mar 2, 2013 at 10:40 AM, bvdp <b...@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.
This wasn't introduced until Python 3.3 see
http://docs.python.org/3/whatsnew/3.3.html#pep-3151-reworking-the-os-and-io-exception-hierarchy
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.
--
Cheers.
Mark Lawrence
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