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Python Raise Custom Exception

Sign up Python When I catch an exception, how do I get the type, file, and line number? up vote 115 down vote favorite 40 Catching an exception that would print like this: Traceback (most recent call last): File "c:/tmp.py", line 1, in 4 / 0 ZeroDivisionError: integer division or modulo by zero I want to format it into: ZeroDivisonError, tmp.py, python print exception 1 python exception exception-handling stack-trace share|improve this question asked Aug 14 '09 at 16:02 Claudiu 94.7k92307493 1 Use the built-in traceback module. –Ned Deily Aug 14 '09 at 16:10 It may also be helpful to print line of code, where exception happened: see stackoverflow.com/questions/14519177/… –Apogentus Nov 28 '13 at 10:52 add a comment| 2 Answers 2 active oldest votes up vote 161 down vote accepted import sys, os try: raise NotImplementedError("No error") except Exception as e: exc_type, exc_obj, exc_tb = sys.exc_info() fname = os.path.split(exc_tb.tb_frame.f_code.co_filename)[1] print(exc_type, fname, exc_tb.tb_lineno) share|improve this answer edited Feb 20 '13 at 18:51 David Cain 8,042104055 answered Aug 14 '09 at 16:09 Ants Aasma 30.8k46281 24 You should be careful about unpacking sys.exc_info() into local variables, since if you get an exception in the except handler, the local vars could get kept in a circular reference and not GC'd. Best practice is to always just use slices off of sys.exc_info() instead. Or use other modules like traceback, as other posters have suggested. –Daniel Pryden Aug 17 '09 at 23:13 1 is tb just exc_tb? and os.path.spli

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6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to get name of exception that was caught in Python? up vote 25 down vote favorite 8 http://stackoverflow.com/questions/1278705/python-when-i-catch-an-exception-how-do-i-get-the-type-file-and-line-number How can I get the name of an exception that was raised in Python? e.g., try: foo = bar except Exception as exception: name_of_exception = ??? assert name_of_exception == 'NameError' print "Failed with exception [%s]" % name_of_exception For example, I am catching multiple (or all) exceptions, and want to print the name of the exception in an error message. python exception exception-handling share|improve this question edited Sep 12 at 20:02 asked Aug 11 http://stackoverflow.com/questions/18176602/how-to-get-name-of-exception-that-was-caught-in-python '13 at 20:56 Rob Bednark 5,46573265 2 Why do you think you need this? Why not catch a more concrete exception (e.g. except NameError:) to begin with? –delnan Aug 11 '13 at 21:07 2 I have a couple scenarios where I want to catch all exceptions (or a list of them), and want to print out the name of the exception in an error message. –Rob Bednark Aug 12 '13 at 7:04 1 You might want to check out the standard library's traceback module, which has functions that do some nice formatting of exceptions and tracebacks. –Blckknght May 22 '14 at 23:16 @delnan this situation arises when you are testing if a function is raising an exception as programmed –gokul_uf Mar 14 at 15:32 add a comment| 2 Answers 2 active oldest votes up vote 47 down vote accepted Here are two different ways to get the name of the exception: type(exception).__name__ exception.__class__.__name__ e.g., try: foo = bar except Exception as exception: assert type(exception).__name__ == 'NameError' assert exception.__class__.__name__ == 'NameError' share|improve this answer edited Apr 3 '15 at 18:44 Rob Bednark 5,46573265 answered Aug 11 '13 at 21:06 Tim 2,34811331 Perfect! Thanks @Tim! –Rob Bednark Aug 12 '13 at 7:06 add a comment| up vote 0 down v

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" If you wanted to examine the https://wiki.python.org/moin/HandlingExceptions exception from code, you could have: 1 (x,y) = (5,0) 2 try: 3 z = http://pro.arcgis.com/en/pro-app/arcpy/get-started/error-handling-with-python.htm 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 to be as specific as possible (CatchWhatYouCanHandle). In the first example python exception 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 the output web page, and the server to continue to run, if at all possible. But you python get error 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 cleanup_stuff() Finding Specific Exception Names Standard exceptions that can be raised are detailed at: http://docs.python.org/library/exceptions.html Look to class documentation to find out what exceptions a given class can raise. See Also: On this wiki: WritingExceptionCla

for Developers Tools to build location-aware apps ArcGIS Solutions Free template maps and apps for your industry ArcGIS Marketplace Get apps and data for your organization Documentation Pricing Support Esri Sign In user My Profile Sign Out Go ArcGIS Pro HomeGet StartedHelpTool ReferenceArcPySDKCommunity Error handling with Python try-except statementraise statementExecuteError classtraceback Getting error messages from a result object Errors happen. Writing scripts that expect and handle errors can save time and frustration. When a tool returns an error message, ArcPy generates a system error or exception. In Python, you can provide a variety of structures and methods that can handle exceptions. Of course, a script can fail for other reasons not related to a geoprocessing tool. These also need to be caught and dealt with in an appropriate manner. The following sections offer a few techniques that introduce the basics of Python exception handling.When a tool writes an error message, ArcPy generates an arcpy.ExecuteError exception. Python allows you to write a routine that automatically runs when a system error is generated. In this error-handling routine, retrieve the error message from ArcPy and react accordingly. If a script does not have an error-handling routine, it fails immediately, which decreases its robustness. Use error-handling routines to manage errors and improve a script's usability.Geoprocessing tool error messages are accompanied by a six-digit code. These ID codes have been documented to provide additional information on their cause and how they can be dealt with.try-except statementA try-except statement can be used to wrap entire programs or just particular portions of code to trap and identify errors. If an error occurs within the try statement, an exception is raised, and the code under the except statement is executed. Using a basic except statement is the most basic form of error handling.In the following code, Buffer fails because the required buffer_distance_or_field argument has not been provided. Instead of failing without explanation, the except statement is used to trap the error, then fetch and print the error message generated by Buffer. Note that the except block is only executed if Buffer returns an error.import arcpy import sys try: # Execute the Buffer tool # arcpy.

 

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