That is because 'errno' is a property on the exception object called 'e', not the other way around.
On Sun, Mar 25, 2012 at 7:12 AM, Michael Lewis <mjole...@gmail.com> wrote: > > > On Sat, Mar 24, 2012 at 3:51 PM, Colton Myers <colton.my...@gmail.com>wrote: > >> I am having a bit of trouble understanding what is going on below. What >> does the "e" in "except OSError, e:" do? >> Any other help you can provide regarding errno would be extremely >> appreciated. I've done help() and dir() on it, but I am not really >> understanding what's going on with "e.errno != errno.EEXIST:" >> >> Basically, that `except` block is catching all exceptions of type >> OSError, and storing the exception in variable `e`. This variable does not >> have to be called `e`, but that's the most commonly-used variable name. >> >> Once you have the exception stored (in this case in the variable `e`), >> you can then see what type of exception, using the `errno` property of the >> exception. You can read about the different types here: >> >> http://docs.python.org/library/errno.html >> >> import os, errnotry: >> os.makedirs('a/b/c')except OSError, e: >> if e.errno != errno.EEXIST: >> raise >> >> In this particular section, it's catching any OSError, and then if it >> turns out that the error was "File Exists", it is raising that exception >> again, to be either caught by an encapsulating try block, or which will >> bring the program to a halt with an exception shown by the interpreter. >> >> Is that the behavior you are going for? Any more confusion? >> > > Why wouldn't it be errno.e instead of e.errno? > >> >> -- >> Colton Myers >> >> > > > -- > Michael J. Lewis > > mjole...@gmail.com > 415.815.7257 > > > _______________________________________________ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > http://mail.python.org/mailman/listinfo/tutor > > -- Regards, Sithembewena Lloyd Dube
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