Will code in a Finally statement fire if I return a value in a Try block?
Simple answer: Yes.
try-catch
Why is “except: pass” a bad programming practice?
As you correctly guessed, there are two sides to it: Catching any error by specifying no exception type after except, and simply passing it without taking any action. My explanation is “a bit” longer—so tl;dr it breaks down to this: Don’t catch any error. Always specify which exceptions you are prepared to recover from and … Read more
Can I try/catch a warning?
Set and restore error handler One possibility is to set your own error handler before the call and restore the previous error handler later with restore_error_handler(). set_error_handler(function() { /* ignore errors */ }); dns_get_record(); restore_error_handler(); You could build on this idea and write a re-usable error handler that logs the errors for you. set_error_handler([$logger, ‘onSilencedError’]); … Read more
Why should I not wrap every block in “try”-“catch”?
A method should only catch an exception when it can handle it in some sensible way. Otherwise, pass it on up, in the hope that a method higher up the call stack can make sense of it. As others have noted, it is good practice to have an unhandled exception handler (with logging) at the … Read more
How to write trycatch in R
Well then: welcome to the R world 😉 Here you go Setting up the code urls <- c( “http://stat.ethz.ch/R-manual/R-devel/library/base/html/connections.html”, “http://en.wikipedia.org/wiki/Xz”, “xxxxx” ) readUrl <- function(url) { out <- tryCatch( { # Just to highlight: if you want to use more than one # R expression in the “try” part then you’ll have to # use … Read more
Is it a good practice to use try-except-else in Python?
“I do not know if it is out of ignorance, but I do not like that kind of programming, as it is using exceptions to perform flow control.” In the Python world, using exceptions for flow control is common and normal. Even the Python core developers use exceptions for flow-control and that style is heavily … Read more
Why catch and rethrow an exception in C#?
First; the way that the code in the article does it is evil. throw ex will reset the call stack in the exception to the point where this throw statement is; losing the information about where the exception actually was created. Second, if you just catch and re-throw like that, I see no added value, … Read more
Can I catch multiple Java exceptions in the same catch clause?
This has been possible since Java 7. The syntax for a multi-catch block is: try { … } catch (IllegalArgumentException | SecurityException | IllegalAccessException | NoSuchFieldException e) { someCode(); } Remember, though, that if all the exceptions belong to the same class hierarchy, you can simply catch that base exception type. Also note that you … Read more
How to catch and print the full exception traceback without halting/exiting the program?
traceback.format_exc() or sys.exc_info() will yield more info if that’s what you want. import traceback import sys try: do_stuff() except Exception: print(traceback.format_exc()) # or print(sys.exc_info()[2])
Try-catch speeding up my code?
One of the Roslyn engineers who specializes in understanding optimization of stack usage took a look at this and reports to me that there seems to be a problem in the interaction between the way the C# compiler generates local variable stores and the way the JIT compiler does register scheduling in the corresponding x86 … Read more