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
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