exception-handling

问题 I would like to except the error the following code produces, but I don't know how. from datetime import datetime try: date = datetime(2009, 12a, 31) except: print "error" The code above is not printing "error" . That's what I would like to be able to do. edit: The reason I would like to check for syntax errors, is because 12a is a command line parameter. Thanks. 回答1: command-line "parameters" are strings. if your code is: datetime(2009, '12a', 31) it won't produce SyntaxError . It raises

问题 Is there a way to use multiple exceptions in python? Like code below: try: #mycode except AttributeError TypeError ValueError: #my exception What I mean is how to use AttributeError TypeError ValueError with each other? 回答1: Use a tuple: try: # mycode except (AttributeError, TypeError, ValueError): # catches any of the three exception types above Quoting the reference try statement documentation: When an exception occurs in the try suite, a search for an exception handler is started. This

问题 I know there is some similar questions here about how to parse ENUM, how to parse customize JSON structure. But here my question is how to just give a better message when the user submit some JSON with is not as expected. This is the code: @PutMapping public ResponseEntity updateLimitations(@PathVariable("userId") String userId, @RequestBody LimitationParams params) { Limitations limitations = user.getLimitations(); params.getDatasets().forEach(limitations::updateDatasetLimitation); params

问题 I know there is some similar questions here about how to parse ENUM, how to parse customize JSON structure. But here my question is how to just give a better message when the user submit some JSON with is not as expected. This is the code: @PutMapping public ResponseEntity updateLimitations(@PathVariable("userId") String userId, @RequestBody LimitationParams params) { Limitations limitations = user.getLimitations(); params.getDatasets().forEach(limitations::updateDatasetLimitation); params

问题 Programming Java in Eclipse, I'm used to having to deal with exceptions. In C# with VisualStudio it seems I can not say "throws exception" on a method... After a lot of coding I found lots of exceptions, and had to catch them as I found them during testing. I'd like to be forced to handling them, so that VisualStudio can say that here you need a catch or I'm not going to let you go on :) Is this possible? Thanks 回答1: No. C# doesn't force you to handle exceptions. This was a concious design

问题 Programming Java in Eclipse, I'm used to having to deal with exceptions. In C# with VisualStudio it seems I can not say "throws exception" on a method... After a lot of coding I found lots of exceptions, and had to catch them as I found them during testing. I'd like to be forced to handling them, so that VisualStudio can say that here you need a catch or I'm not going to let you go on :) Is this possible? Thanks 回答1: No. C# doesn't force you to handle exceptions. This was a concious design

问题 Programming Java in Eclipse, I'm used to having to deal with exceptions. In C# with VisualStudio it seems I can not say "throws exception" on a method... After a lot of coding I found lots of exceptions, and had to catch them as I found them during testing. I'd like to be forced to handling them, so that VisualStudio can say that here you need a catch or I'm not going to let you go on :) Is this possible? Thanks 回答1: No. C# doesn't force you to handle exceptions. This was a concious design

问题 The below picture shows that "Checked" and "Unchecked" Exceptions are subclasses of Exception . I find it confusing that you need to catch an Exception but you don't need to catch a RuntimeException , which directly inherits from Exception . Is there a reason that the devs didn't let us throw Exceptions without needing to catch them? More specifically: Why can you ignore only RuntimeExceptions and it's children? Why wasn't there a Class introduced called CheckedException extends Exception and

问题 The below picture shows that "Checked" and "Unchecked" Exceptions are subclasses of Exception . I find it confusing that you need to catch an Exception but you don't need to catch a RuntimeException , which directly inherits from Exception . Is there a reason that the devs didn't let us throw Exceptions without needing to catch them? More specifically: Why can you ignore only RuntimeExceptions and it's children? Why wasn't there a Class introduced called CheckedException extends Exception and

问题 In my ASP.NET MVC 3 project I'm calling a web service for login authentication. But it throws an exception: Exception Details: An asynchronous operation cannot be started at this time. Asynchronous operations may only be started within an asynchronous handler or module or during certain events in the Page lifecycle. If this exception occurred while executing a Page, ensure that the Page is marked <%@ Page Async="true" %>. How to fix this issue? 回答1: Make sure that your Controller method