Python Get Error Message From Exception
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Python Exception Stack Trace
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Python Custom Exception
just like you, helping each other. Join them; it only takes a minute: Sign up python exception message capturing up vote 75 down vote favorite 7 import ftplib import urllib2 import os import logging logger = logging.getLogger('ftpuploader') hdlr = logging.FileHandler('ftplog.log') formatter = logging.Formatter('%(asctime)s %(levelname)s %(message)s') hdlr.setFormatter(formatter) logger.addHandler(hdlr) logger.setLevel(logging.INFO) FTPADDR = "some ftp address" def upload_to_ftp(con, filepath): syntax for generic except clause in python try: f = open(filepath,'rb') # file to send con.storbinary('STOR '+ filepath, f) # Send the file f.close() # Close file and FTP logger.info('File successfully uploaded to '+ FTPADDR) except, e: logger.error('Failed to upload to ftp: '+ str(e)) This doesn't seem to work, I get syntax error, what is the proper way of doing this for logging all kind of exceptions to a file python exception logging except share|improve this question asked Jan 14 '11 at 11:33 Hellnar 11.5k46144233 2 Your indentation is broken. And omit the , after except. –Sven Marnach Jan 14 '11 at 11:35 2 @SvenMarnach, if you omit the , after except, you'll get global name 'e' is not defined, which is not much better than wrong syntax. –Val Nov 18 '13 at 11:11 4 @Val: Should be except Exception as e or except Exception, e, depending on Python version. –Sven Marnach Nov 19 '13 at 13:03 add a comment| 5 Answers 5 active oldest votes up vote 110 dow
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
Python Try Without Except
the exception from code, you could have: 1 (x,y) = (5,0) 2 try: 3
Python Try Except Else
z = x/y 4 except ZeroDivisionError as e: 5 z = e # representation: " Error: %s
Data Types: Lists and StringsList ManipulationsShallow and Deep CopyDictionariesSets and Frozen Setsinput via the keyboardConditional StatementsLoops, while LoopFor LoopsOutput with PrintFormatted output with string modulo and the format methodFunctionsRecursion and Recursive FunctionsParameter http://www.python-course.eu/python3_exception_handling.php Passing in FunctionsNamespacesGlobal and Local VariablesDecoratorsMemoization with DecoratorsRead and Write FilesModular Programming and ModulesRegular ExpressionsRegular Expressions, AdvancedLambda Operator, Filter, Reduce and MapList ComprehensionIterators and GeneratorsException HandlingTests, DocTests, UnitTestsObject Oriented http://www.ianbicking.org/blog/2007/09/re-raising-exceptions.html ProgrammingClass and Instance AttributesProperties vs. getters and settersInheritanceMultiple InheritanceMagic Methods and Operator OverloadingOOP, Inheritance ExampleSlotsClasses and Class CreationRoad to MetaclassesMetaclassesMetaclass Use Case: Count Function Calls Exceptions "Nothing travels python exception faster than the speed of light with the possible exception of bad news, which obeys its own special laws." (Douglas Adams) "General principles should not be based on exceptional cases." (Robert J. Sawyer) This website is supported by: Linux and Python Training Courses This topic in German / Deutsche Übersetzung: AusnahmebehandlungPython 3This is a tutorial in Python3, but python get error this chapter of our course is available in a version for Python 2.x as well: Exception Handling in Python 2.x Training Classes This website aims at providing you with educational material suitable for self-learning. Nevertheless, it is faster and more efficient to attend a "real" Python course in a classroo, with an experienced trainer. So why not attend one of the live Python courses in Strasbourg, Paris, London, Berlin, Munich, Hamburg, Frankfurt, or Lake Constance by Bernd Klein, the author of this tutorial? In-house Training Courses If you like it, we will come to your company or institute and provide a special training for your employees, as we've done it many times in Amsterdam (The Netherlands), Berlin (Germany), Bern (Switzerland), Basel (Switzerland), Zurich (Switzerland), Frankfurt (Germany), Locarno (Switzerland), Den Haag (The Hague), Hamburg, Toronto (Canada), Edmonton (Canada), Munich (Germany) and many other cities. We do training courses in England, Switzerland, Liechtenstein, Austria, Germany, France, Belgium, the Netherlands, Luxembourg, Poland, UK, Italy and other locations in Europe and in Canada. This way yo
a little mini-tutorial for Python programmers, aboutexceptions… First, this isbad: try: some_code() except: revert_stuff() raise Exception("some_code failed!") It is bad because all the information about how some_code() failed is lost. The traceback, the error message itself. Maybe it was an expected error, maybe itwasn't. Here's a modest improvement (but still not verygood): try: some_code() except: import traceback traceback.print_exc() revert_stuff() raise Exception("some_code failed!") traceback.print_exc() prints the original traceback to stderr. Sometimes that's the best you can do, because you really want to recover from an unexpected error. But if you aren't recovering, this is what you shoulddo: try: some_code() except: revert_stuff() raise Using raise with no arguments re-raises the last exception. Sometimes people give a blank never use "except:" statement, but this particular form (except: + raise) isokay. There's another form of raise that not many people know about, but can also be handy. Like raise with no arguments, it can be used to keep thetraceback: try: some_code() except: import sys exc_info = sys.exc_info() maybe_raise(exc_info) def maybe_raise(exc_info): if for some reason this seems like it should be raised: raise exc_info[0], exc_info[1], exc_info[2] This can be handy if you need to handle the exception in some different part of the code from where the exception happened. But usually it's not that handy; it's an obscure feature for areason. Another case when people often clobber the traceback is when they want to add information to it,e.g.: for lineno, line in enumerate(file): try: process_line(line) except Exception, exc: raise Exception("Error in line %s: %s" % (lineno, exc)) You keep the error message here, but lose the traceback. There's a couple ways to keep that traceback. One I sometimes use is to retain the exception, but change themessage: except Exception, exc: args = exc.args if not args: arg0 = '' else: arg0 = args[0] arg0 += ' at line %s' % lineno exc.args = arg0 + args[1:] raise It's a little awkward. Technically (though it's deprecated) you can raise anything as an exception. If you use except Exception: you won't catch things like string exceptions or other weird types. It's up to you to decide if you care about these cases; I generally ignore them. It's also possible that an exception won't have .args, or the string message for the exception won't be derived from those