Exception returning no exception

Question

I got a code something like this:

try: do_something() except (urllib2.URLError, socket.timeout), er: print something except Exception, ex: print "The code failed because", ex, "Please review"

Now, the problem is on executing the above code I am getting following output:

The code failed because Please review

p.s.: The 'ex' should return the name of the exception but its not returning anything. Any idea why?

In reference to @Yuji and @Peter, I tried this code:

try: try: print x except Exception, ex: print "ex:", ex raise except Exception, er: print "er:", er

And the Output was:

ex: name 'x' is not defined . er: name 'x' is not defined .

Now, why raise(er) is returning an error? And why it does not in you cases?

@Yuji: can you please elaborate? May be with an example where raise at somewhere causes exception returning nothing. — codersofthedark
– codersofthedark, Commented Nov 23, 2011 at 5:13
@dragonsrsupercool for example, printing the exception message for raise Exception prints nothing. printing the exception for raise Exception('foo') or raise Exception, 'foo' prints "foo" — Yuji 'Tomita' Tomita
– Yuji 'Tomita' Tomita, Commented Nov 23, 2011 at 5:22
@Yuji: I have added a code block above, can you please review and tell why raise is returning error in my case but not in yours? — codersofthedark
– codersofthedark, Commented Nov 23, 2011 at 5:36
@dragonsrsupercool - you are not raising an exception, python is raising an exception because x is not defined, and the exception message for that NameError is "name 'x' is not defined". Update: the raise in the outer block is re-raising the first exception as it's supposed to — Yuji 'Tomita' Tomita
– Yuji 'Tomita' Tomita, Commented Nov 23, 2011 at 5:52

勿绮语 · Accepted Answer · 2012-02-17 00:14:19Z

Not necessarily - the expectation is not entirely true. The following code prints nothing:

try: raise BaseException() except BaseException, ex: print ex

But this prints "abc":

try: raise BaseException("abc") except BaseException, ex: print ex

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