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Python Continue Loop After Exception

up How to raise a warning in Python without stopping (interrupting) the program? up vote 42 down vote favorite 2 I am dealing with a problem how to raise a Warning in Python without having to let the program crash / stop

Pythonwarnings

/ interrupt. I use following simple function that only checks if the user passed to it a non-zero number. If the user passes a zero, the program should warn the user, but continue normally. It should work like the following code, but should use class Warning(), Error() or Exception() instead of printing the warning out manually. def isZero( i): if i != 0: print "OK" else: print "WARNING: the input is 0!" return i If I use the code below and pass 0 python warnings vs logging to the function, the program crashes and the value is never returned. Instead, I want the program to continue normally and just inform the user that he passed 0 to the function. def isZero( i): if i != 0: print "OK" else: raise Warning("the input is 0!") return i The point is that I want to be able to test that a warning has been thrown testing it by unittest. If I simply print the message out, I am not able to test it with assertRaises in unittest. Thank you, Tomas python exception-handling error-handling warnings share|improve this question edited Oct 8 '10 at 15:30 asked Oct 8 '10 at 15:01 Tomas Novotny 88231520 How exactly do you want to notify the user? through email or SMS? cause that can be hooked up but you need to be specific. –aaronasterling Oct 8 '10 at 15:05 1 Why don't you just print the message? –sje397 Oct 8 '10 at 15:06 @sje397 The point is that I want to be able to test that a warning has been thrown testing it by unittest. If I simply print the message out, I am not able to do that with assertRaises in unittest. –Tomas Novotny Oct 8 '10 at 15:16 add a comment| 2 Answers 2 active oldest votes up vote 43 down vote accepted You shouldn't raise the warning, you should be using warnings module. By raising it you're generating error, rather than warning. share|improve this answer edite

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About python raise warning and continue Us Learn more about Stack Overflow the company Business Learn more about hiring python3 warning developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the python custom warnings Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Python: How to ignore an exception http://stackoverflow.com/questions/3891804/how-to-raise-a-warning-in-python-without-stopping-interrupting-the-program and proceed? [duplicate] up vote 144 down vote favorite 24 This question already has an answer here: Try/Except in Python: How do you properly ignore Exceptions? 10 answers I have a try...except block in my code and When an exception is throw. I really just want to continue with the code because in that case, everything is still able to run just fine. The problem is http://stackoverflow.com/questions/574730/python-how-to-ignore-an-exception-and-proceed if you leave the except: block empty or with a #do nothing, it gives you a syntax error. I can't use continue because its not in a loop. Is there a keyword i can use that tells the code to just keep going? python exception share|improve this question edited Jan 2 '10 at 1:03 Rob 38.9k25885 asked Feb 22 '09 at 11:02 The.Anti.9 11.2k3697147 marked as duplicate by Eric Brown, Siddharth, mishik, zhangyangyu, mdahlman Jul 24 '13 at 4:17 This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question. add a comment| 4 Answers 4 active oldest votes up vote 237 down vote accepted except: pass share|improve this answer answered Feb 22 '09 at 11:03 Andy Hume 21.1k42440 50 except Exception: pass # important not to swallow other exceptions! –Roger Pate Feb 22 '09 at 16:46 8 @Aaron - I agree, but the question wasn't if this was a good/bad idea –David Feb 23 '09 at 20:05 12 This will catch SystemExit, KeyboardInterrupt and other things that you probably don't want to catch. –FogleBird Jan 2 '10 at 1:13

Pages Local Site Map ------------------------ Rename Page Delete Page ------------------------ ------------------------ Remove Spam Revert to this revision ------------------------ SlideShow User Login Handling Exceptions The simplest way to handle exceptions is with a "try-except" block: 1 (x,y) = (5,0) 2 try: 3 z = x/y 4 except ZeroDivisionError: 5 print "divide by zero" https://wiki.python.org/moin/HandlingExceptions If you wanted to examine the exception from code, you could have: 1 (x,y) http://www.gossamer-threads.com/lists/python/python/808525 = (5,0) 2 try: 3 z = x/y 4 except ZeroDivisionError as e: 5 z = e # representation: "" 6 print z # output: "integer division or modulo by zero" General Error Catching Sometimes, you want to catch all errors that could possibly be generated, but usually you don't.In most cases, you want python raise to be as specific as possible (CatchWhatYouCanHandle). In the first example above, if you were using a catch-all exception clause and a user presses Ctrl-C, generating a KeyboardInterrupt, you don't want the program to print "divide by zero". However, there are some situations where it's best to catch all errors. For example, suppose you are writing an extension module to a web service. You want the error information to output python raise error the output web page, and the server to continue to run, if at all possible. But you have no idea what kind of errors you might have put in your code. In situations like these, you may want to code something like this: 1 import sys 2 try: 3 untrusted.execute() 4 except: # catch *all* exceptions 5 e = sys.exc_info()[0] 6 write_to_page( "

Error: %s

" % e ) MoinMoin software is a good example of where general error catching is good. If you write MoinMoin extension macros, and trigger an error, MoinMoin will give you a detailed report of your error and the chain of events leading up to it. Python software needs to be able to catch all errors, and deliver them to the recipient of the web page. Another case is when you want to do something when code fails: 1 try: 2 do_some_stuff() 3 except: 4 rollback() 5 raise 6 else: 7 commit() By using raise with no arguments, you will re-raise the last exception. A common place to use this would be to roll back a transaction, or undo operations. If it's a matter of cleanup that should be run regardless of success or failure, then you would do: 1 try: 2 do_some_stuff() 3 finally: 4 cl

Post #1 of 8 (12268 views) Permalink Is there a way to continue after an exception ? hello, I would like my program to continue on the next line after an uncaught exception, is that possible ? thanks Stef Mientki krister.svanlund at gmail Feb20,2010,3:59PM Post #2 of 8 (12183 views) Permalink Re: Is there a way to continue after an exception ? [In reply to] On Sun, Feb 21, 2010 at 12:52 AM, Stef Mientki wrote: > hello, > > I would like my program to continue on the next line after an uncaught > exception, > is that possible ? > > thanks > Stef Mientki > Yes, you catch the exception and do nothing. -- http://mail.python.org/mailman/listinfo/python-list lie.1296 at gmail Feb20,2010,4:21PM Post #3 of 8 (12177 views) Permalink Re: Is there a way to continue after an exception ? [In reply to] > On Sun, Feb 21, 2010 at 12:52 AM, Stef Mientki wrote: >> hello, >> >> I would like my program to continue on the next line after an uncaught >> exception, >> is that possible ? >> >> thanks >> Stef Mientki >> That reminds me of VB's "On Error Resume Next" -- http://mail.python.org/mailman/listinfo/python-list fetchinson at googlemail Feb20,2010,4:32PM Post #4 of 8 (12184 views) Permalink Re: Is there a way to continue after an exception ? [In reply to] > I would like my program to continue on the next line after an uncaught > exception, > is that possible ? try: # here is your error except: pass # this will get executed no matter what See http://docs.python.org/tutorial/errors.html HTH, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list lie.1296 at gmail Feb20,2010,6:17PM Post #5 of 8 (12192 views) Permalink Re: Is there a way to continue after an exception ? [In reply to] On 02/21/10 12:02, Stef Mientki wrote: > On 21-02-2010 01:21, Lie Ryan wrote: >>> On Sun, Feb 21, 2010 at 12:52 AM, Stef Mientki

 

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