Error Inserting Into Queue Reraising Url
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to determine IP address from host name python 3 rethrow exception www.iwebtool.com The DNS server returned: Server Failure: The name server was unable to process
Python Six Reraise
this query. This means that the cache was not able to resolve the hostname presented in the URL. Check if the address is correct. Your cache administrator is webmaster. Generated Tue, 11 Oct 2016 21:00:42 GMT by s_wx1131 (squid/3.5.20)
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Python 3 Reraise Exception
programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Adding information to an exception? up vote 47 down vote favorite 10 EDIT: I am running python 2.6 I want to http://www.iwebtool.com/keyword_lookup/?&num=100p=4sort=keywordorder=desc&sort=count&order=asc&p=2511 achieve something like this: def foo(): try: raise IOError('Stuff ') except: raise def bar(arg1): try: foo() except Exception as e: e.message = e.message + 'happens at %s' % arg1 raise bar('arg1') Traceback... IOError('Stuff Happens at arg1') But what I get is: Traceback.. IOError('Stuff') Any clues as to how to achieve this? python exception-handling share|improve this question edited Sep 24 at 16:48 martineau 40.1k65489 asked May 19 '11 at 17:34 anijhaw 3,52622133 The http://stackoverflow.com/questions/6062576/adding-information-to-an-exception real question is why? –Cat Plus Plus May 19 '11 at 17:45 While looking for documentation for the Exception message attribute I found this SO question, BaseException.message deprecated in Python 2.6, which seems to indicate its use is now discouraged (and why it's not in the docs). –martineau May 19 '11 at 19:50 sadly, that link doesn't seem to work anymore. –Michael Scott Cuthbert Dec 8 '13 at 20:55 1 @MichaelScottCuthbert here's a good alternative: itmaybeahack.com/book/python-2.6/html/p02/… –Niels Keurentjes Jan 17 '14 at 16:08 Here's a really good explanation of what the status of the message attribute is and its relationship to the args attribute and PEP 352. It's from the free book Building Skills in Python by Steven F. Lott. –martineau May 7 '14 at 0:20 add a comment| 6 Answers 6 active oldest votes up vote 46 down vote accepted I'd do it like this so changing its type in foo() won't require also changing it in bar(). def foo(): try: raise IOError('Stuff') except: raise def bar(arg1): try: foo() except Exception as e: raise type(e)(e.message + ' happens at %s' % arg1) bar('arg1') Traceback (most recent call last): File "test.py", line 13, in
to be able to manipulate exceptions http://nedbatchelder.com/blog/200711/rethrowing_exceptions_in_python.html in ways other than simply throwing and catching them. One of these is to re-throw exceptions.The simplest way to do https://docs.python.org/3/whatsnew/changelog.html this is if you need to perform a little work after the catch, but then immediately re-throw. This can raise exception be done with a simple raise statement:try:
do_something_dangerous()
except:
do_something_to_apologize()
raise
Here the raise statement means, "throw the exception last caught". This is a simple case, and I probably didn't need to remind you of it. error inserting into But a more sophisticated technique is to catch an exception in one place, and raise it again in another.For example, you may have a worker thread pre-fetching data from slow storage, and then on the main thread, the consumer of the data either gets the data or sees the exception that prevented him from getting the data. Here's the simple implementation: 1 class DelayedResult:
2 def __init__(self):
3 self.e = None
4 self.result = None
5
6 def do_work(self):
7 try:
8 self.result = self.do_s
and tests for PyUnicode_CopyCharacters(). Patch by Xiang Zhang. Issue #28376: The type of long range iterator is now registered as Iterator. Patch by Oren Milman. Issue #28376: The constructor of range_iterator now checks that step is not 0. Patch by Oren Milman. Issue #26906: Resolving special methods of uninitialized type now causes implicit initialization of the type instead of a fail. Issue #18287: PyType_Ready() now checks that tp_name is not NULL. Original patch by Niklas Koep. Issue #24098: Fixed possible crash when AST is changed in process of compiling it. Issue #28350: String constants with null character no longer interned. Issue #26617: Fix crash when GC runs during weakref callbacks. Issue #27942: String constants now interned recursively in tuples and frozensets. Issue #21578: Fixed misleading error message when ImportError called with invalid keyword args. Issue #28203: Fix incorrect type in error message from complex(1.0, {2:3}). Patch by Soumya Sharma. Issue #27955: Fallback on reading /dev/urandom device when the getrandom() syscall fails with EPERM, for example when blocked by SECCOMP. Issue #28131: Fix a regression in zipimport's compile_source(). zipimport should use the same optimization level as the interpreter. Issue #25221: Fix corrupted result from PyLong_FromLong(0) when Python is compiled with NSMALLPOSINTS = 0. Issue #25758: Prevents zipimport from unnecessarily encoding a filename (patch by Eryk Sun) Issue #28189: dictitems_contains no longer swallows compare errors. (Patch by Xiang Zhang) Issue #27812: Properly clear out a generator's frame's backreference to the generator to prevent crashes in frame.clear(). Issue #27811: Fix a crash when a coroutine that has not been awaited is finalized with warnings-as-errors enabled. Issue #27587: Fix another issue found by PVS-Studio: Null pointer check after use of ‘def' in _PyState_AddModule(). Initial patch by Christian He