[Tutor] IOError exception handling
Allyn Weaks
allyn.@tardigrade.net
Mon, 29 Jul 2002 02:02:21 -0700
On 28/7/02, Danny Yoo wrote:
"Sean 'Shaleh' Perry" <shalehperry@attbi.com> wrote
>> As you can see, IOError covers many issues
>>
>> >>> try:
>> ... fd = open('/home/shoon/xinitrc')
>> ... except IOError, e:
>> ... print e[0], e[1]
>> ...
>> 13 Permission denied
>>
>> I am sure there is a wrapper for errno somewhere in python.
>
>Here you go:
>
> http://www.python.org/doc/lib/module-errno.html
Many thanks. Betwixt the two of you, I've now got:
def errortest():
try:
fd = open(filename)
text = fd.readlines()
return len(text)
except IOError, e:
if e[0] == 2: return 0 # file not found
print e # any other error
sys.exit(1)
Which works when I force errors of several types. Do I need the
sys.exit(1), and is 1 a reasonable generic number? I've seen it in
several examples, and since I'm still partly in monkey-see, monkey-do
mode, I stuck it in even though it superficially works without it. :-)
--
Allyn Weaks allyn@tardigrade.net Seattle, WA Sunset zone 5
Pacific NW Native Wildlife Gardening: http://www.tardigrade.org/natives/
"The benefit of even limited monopolies is too doubtful, to be opposed
to that of their general suppression." Thomas Jefferson