exception-handling

问题 If I have a DataFrame: myDF = DataFrame(data=[[11,11],[22,'2A'],[33,33]], columns = ['A','B']) Gives the following dataframe (Starting out on stackoverflow and don't have enough reputation for an image of the DataFrame) | A | B | 0 | 11 | 11 | 1 | 22 | 2A | 2 | 33 | 33 | If i want to convert column B to int values and drop values that can't be converted I have to do: def convertToInt(cell): try: return int(cell) except: return None myDF['B'] = myDF['B'].apply(convertToInt) If I only do: myDF[

问题 If I have a DataFrame: myDF = DataFrame(data=[[11,11],[22,'2A'],[33,33]], columns = ['A','B']) Gives the following dataframe (Starting out on stackoverflow and don't have enough reputation for an image of the DataFrame) | A | B | 0 | 11 | 11 | 1 | 22 | 2A | 2 | 33 | 33 | If i want to convert column B to int values and drop values that can't be converted I have to do: def convertToInt(cell): try: return int(cell) except: return None myDF['B'] = myDF['B'].apply(convertToInt) If I only do: myDF[

问题 Consider the following code: test1 <- "a" test2 <- "a" tryCatch(stop(), error= function(err){ print(test1) print(test2) test1 <- "b" test2 <<- "b" }) Result: print(test1) [1] "a" print(test2) [1] "b" The value of variable test1 is visible within the tryCatch block, but changing it with "<-" operator does not affect its value outside the tryCatch block. If a new value is assigned with <<- it has the desired effect. Why? Is using the <<- operator within the tryCatch block a recommended way to

问题 Is there a convenient way to catch types of exceptions and inner exceptions for try-catch purposes? Example code: $a = 5 $b = Read-Host "Enter number" $c = $a / $b #error if $b -eq 0 $d = get-content C:\I\Do\Not\Exist Row #3 will generate a runtime error with an inner exception (EDIT: fixed this command $Error[1].Exception.InnerException.GetType()), row #4 will generate a "standard"(?) type of exception ($Error[0].Exception.GetType()). Is it possible to get the desired result from both of

问题 I want to throw an exception at next catch, (I attached image) Anybody know how to do this? 回答1: You can't, and trying to do so suggests that you've got too much logic in your catch blocks, or that you should refactor your method to only do one thing. If you can't redesign it, you'll have to nest your try blocks: try { try { ... } catch (Advantage.Data.Provider.AdsException) { if (...) { throw; // Throws to the *containing* catch block } } } catch (Exception e) { ... } 回答2: C# 6.0 to the

来源： https://stackoverflow.com/questions/15099218/use-of-argumentnullexception-when-accessing-arguments-properties

来源： https://stackoverflow.com/questions/15099218/use-of-argumentnullexception-when-accessing-arguments-properties

来源： https://stackoverflow.com/questions/15154586/exit-handler-in-c

来源： https://stackoverflow.com/questions/15154586/exit-handler-in-c

来源： https://stackoverflow.com/questions/25506227/php-exception-inside-catch-how-to-handle-it