Python Exception Print Error Message
Contents |
you have probably seen some. There are (at least) two distinguishable kinds of errors: syntax errors and exceptions. 8.1. Syntax Errors¶ Syntax errors, also known as parsing errors, are perhaps the most common python exception class kind of complaint you get while you are still learning Python: >>> while
Python Exception Stack Trace
True print 'Hello world' File "
Syntax For Generic Except Clause In Python
offending line and displays a little ‘arrow' pointing at the earliest point in the line where the error was detected. The error is caused by (or at least detected at) the token preceding the arrow:
Python Print Exception
in the example, the error is detected at the keyword print, since a colon (':') is missing before it. File name and line number are printed so you know where to look in case the input came from a script. 8.2. Exceptions¶ Even if a statement or expression is syntactically correct, it may cause an error when an attempt is made to execute it. Errors detected during execution python custom exception are called exceptions and are not unconditionally fatal: you will soon learn how to handle them in Python programs. Most exceptions are not handled by programs, however, and result in error messages as shown here: >>> 10 * (1/0) Traceback (most recent call last): File "
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: python try without except 3 z = x/y 4 except ZeroDivisionError: 5 print "divide by zero" python try except else If you wanted to examine the exception from code, you could have: 1 (x,y) = (5,0) 2 try: python try else 3 z = x/y 4 except ZeroDivisionError as e: 5 z = e # representation: " Error: %s
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 http://stackoverflow.com/questions/1483429/how-to-print-an-error-in-python this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question http://www.python-course.eu/python3_exception_handling.php x Dismiss Join the 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 How python exception to print an error in Python? up vote 118 down vote favorite 32 try: something here except: print 'the whatever error occurred.' How can I print the error in my except: block? python error-handling exception-handling share|improve this question edited Jan 1 at 6:49 Slothworks 470514 asked Sep 27 '09 at 11:48 TIMEX 41.2k201525826 6 The currently accepted answer doesn't work in Python python exception print 3, and the prettier except Exception as e: syntax has existed since Python 2.6 (which, incidentally, had been out for a year before even the accepted answer was posted 6 years ago). Pretty much nobody is using 9-year-old Python 2.5 or earlier nowadays, and Python 3's popularity is growing relative to 2.7. It would be helpful for future visitors if you were to accept ilya n's answer instead, since it covers all Python versions; could you please do so? –Mark Amery Nov 4 '15 at 11:50 add a comment| 5 Answers 5 active oldest votes up vote 191 down vote accepted except Exception,e: print str(e) share|improve this answer answered Sep 27 '09 at 12:19 jldupont 41.9k32140259 11 the str() part is redundant -- print e is exactly the same thing as print str(e) [[i.e., print does its own stringification]]. –Alex Martelli Sep 27 '09 at 16:40 4 @alex: doesn't it depends on the subclass (if any) of the exception thrown? The repr method might not have been implemented whilst the str might have. In any case, there isn't a good substitute for an incomplete implementation I gues
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 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 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 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 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 th