try-except

I am trying to figure out how I can catch empty user input using a try and except. If you had this for example: try: #user input here. integer input except ValueError: #print statement saying empty string. Although I also need to catch another value error to make sure they entered an integer and not a character or string how could I use an if and elif setup in order to figure out if it is an empty string or str instead of int If you literally want to raise an exception only on the empty string, you'll need to do that manually: try: user_input = input() # raw_input in Python 2.x if not user

I came across this article about detecting VMWare or Virtual PC http://www.codeproject.com/KB/system/VmDetect.aspx and I saw that they use some kind of try-except statement. So I looked it up in the MSDN: http://msdn.microsoft.com/en-us/library/s58ftw19%28v=vs.80%29.aspx and I don't understand why would I use a try-except instead of the good old try-catch. does it just give me additional information about the exception? If so, I can use a try-catch when I use the code from the attached article, right? thanks :) __try / __except is a try / catch , for a different kind of exception. You can

Accuracy, precision, recall and f-score are measures of a system quality in machine-learning systems. It depends on a confusion matrix of True/False Positives/Negatives. Given a binary classification task, I have tried the following to get a function that returns accuracy, precision, recall and f-score: gold = [1] + [0] * 9 predicted = [1] * 10 def evaluation(gold, predicted): true_pos = sum(1 for p,g in zip(predicted, gold) if p==1 and g==1) true_neg = sum(1 for p,g in zip(predicted, gold) if p==0 and g==0) false_pos = sum(1 for p,g in zip(predicted, gold) if p==1 and g==0) false_neg = sum(1

I am trying to port some code using VC++'s try-except statement to MinGW: bool success = true; __try { //... } __except ((EXCEPTION_STACK_OVERFLOW == GetExceptionCode()) ? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) { success = false; _resetstkoflw(); } return success; Is it possible to write code that catches a stack overflow exception using MinGW g++? You would need to manually call the Windows API functions which register exception handling; namely, AddVectoredExceptionHandler . Note that by using MinGW which does not respect SEH exceptions, throwing any SEH exception or

exc = None try: raise Exception except Exception as exc: pass # ... print(exc) NameError: name 'exc' is not defined This used to work in Python2. Why was it changed this way? If I could at least re-assign to exc , similar to class-level attributes class Foo(object): Bar = Bar but this does not make it work either: exc = None try: raise Exception except Exception as exc: exc = exc Any good hints to achieve the same? I'd prefer not to write something like this: exc = None try: raise Exception("foo") except Exception as e: exc = e # ... print(exc) The try statement explictily limits the scope of

Take the following code as a sample: procedure TForm1.Button1Click(Sender: TObject); var Obj: TSomeObject; begin Screen.Cursor:= crHourGlass; Obj:= TSomeObject.Create; try // do something finally Obj.Free; end; Screen.Cursor:= crDefault; end; if there was an error happening in the // do something section, the TSomeObject that was created I assume will not be freed and the Screen.Cursor will still be stuck as an Hour Glass, because the code was broke before getting to those lines? Now unless I am mistaking, an Exception statement should be in place to deal with any such occurence of an error,

RE: How to correctly write Try..Finally..Except statements? I'm still confused by the OP's original question. Specifically, the last line of the procedure (outside of the try..finally..end) that reads "Screen.Cursor:=crDefault". My understanding is that any exceptions raised inside a try..except|finally..end block WILL execute the code after the "end" of the "try". procedure TForm1.Button1Click(Sender: TObject); var Obj: TSomeObject; begin Screen.Cursor := crHourGlass; Obj := TSomeObject.Create; try // do something finally Obj.Free; end; Screen.Cursor := crDefault; end; In the above example, I