Python - exception's reason in classes

Question

I learn object-oriented programming in python 3. I've some exception, for example:

try:
    self.result = (...)
except urllib.error.URLError as error:
    print(error)

Generally all variables in classes are prefixed with self. Adding self before error variable:

try:
    self.result = (...)
except urllib.error.URLError as self.error:
    print(self.error)

causes:

SyntaxError: invalid syntax

Shall I just skip self before variables containing reason of exception?

'Generally all variables in classes are prefixed with self.' is a comment that shows a massive lack of understanding - you should read up on what self is before trying to use it - understanding the concepts will make everything a lot easier, and it's not a hard thing once you understand it. — Gareth Latty
– Gareth Latty, Commented Oct 6, 2012 at 14:30

user647772 · Accepted Answer · 2012-10-06 14:31:05Z

4

error is the name you gave the exception. It is not a member of your class and thus is not prefixed with self.

answered Oct 6, 2012 at 14:31

user647772

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1 Comment

Martijn Pieters Over a year ago

Interestingly enough, the documented grammar for the try compound statement doesn't disallow using self.error as a target (the target token includes attribute references). However, because the target is to be cleared when the except suite completes, only a local identifier is allowed, really. This is probably a bug in the documentation..

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