[Tutor] Error handling

Russel Winder russel at winder.org.uk
Sun Mar 25 09:22:50 CEST 2012


On Sat, 2012-03-24 at 15:20 -0700, Michael Lewis wrote:

It is perhaps worth noting that in Python 3, the syntax has changed:

> import os, errno
> try:
>     os.makedirs('a/b/c')
> except OSError, e:

except OSError as e :

>     if e.errno != errno.EEXIST:
>         raise

This "as" syntax works in 2.6 and 2.7 so is probably the syntax to use
unless you have to use very old versions of Python.  I think the "as"
syntax makes it clearer that e is a variable referring to the instance
of OSError that causes the except clause to execute if it does.

Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder at ekiga.net
41 Buckmaster Road    m: +44 7770 465 077   xmpp: russel at winder.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder
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