try-catch

来源： https://stackoverflow.com/questions/6817640/catch-any-error-in-python

来源： https://stackoverflow.com/questions/6942747/can-powershell-trap-errors-in-getchilditem-and-continue-looping

来源： https://stackoverflow.com/questions/51959181/javascript-multiple-trys

来源： https://stackoverflow.com/questions/51959181/javascript-multiple-trys

问题 I've been searching for some time now, and I'm sure I've missed it, is there any documentation that states what should be thrown when a value is incorrect/blank? For example, Python has ValueError and the documentation clearly states when to use it. I have the following method: proc getJobinfo {question} { puts -nonewline "$question: " flush stdout gets stdin answer set cleanedanswer [string trim [string totitle $answer]] if {$cleanedanswer eq ""} { # What error should be thrown? } return

问题 I am fetching the SQLite's data in the textView and it is showing following error. I've also set permission of READ and WRITE_EXTERNAL_STORAGE in mainfest but still I'm getting this error: this is quotes.java file: public class quotes extends SQLiteOpenHelper { private static final String Database_name = "quotes.db"; private static final String Database_path = "/data/data/com.birnepal.entrancekoguide/databases/"; private static final String Table_name = "quotes"; private static final String

问题 I am fetching the SQLite's data in the textView and it is showing following error. I've also set permission of READ and WRITE_EXTERNAL_STORAGE in mainfest but still I'm getting this error: this is quotes.java file: public class quotes extends SQLiteOpenHelper { private static final String Database_name = "quotes.db"; private static final String Database_path = "/data/data/com.birnepal.entrancekoguide/databases/"; private static final String Table_name = "quotes"; private static final String

问题 Is there a neat way to have multiply commands in the try block so that it basically tries every single line without stopping as soon as one command yields an error? Basically I want to replace this: try: command1 except: pass try: command2 except: pass try: command3 except: pass with this: try all lines: command1 command2 command3 except: pass Defining a list so I could loop through the commands seems to be a bad solution 回答1: I'd say this is a design smell. Silencing errors is usually a bad

问题 Why the following code doesn't compile? namespace mtm { template<class T> class Matrix { private: public: class AccessIllegalElement; }; Matrix::AccessIllegalElement{}; } I'm trying to implement the inner class for handling errors Error I get: 'Matrix' is not a class, namespace, or enumeration Plus, if inside AccessIllegalElement I want to write a function that prints the illegal index what is preferable? 1) to define a function that takes one parameter 2) to give every class object a member

问题 Consider the following code. class C {} /** * @throws \InvalidArgumentException */ function classCreateInstance($class) { if (!is_string($class)) { throw new \InvalidArgumentException("Class name must be a string."); } if (!class_exists($class)) { throw new \InvalidArgumentException("Class '$class' does not exist."); } return new $class(); } /** * @return C */ function foo() { return classCreateInstance(C::class); } There is one function that may throw an exception, because it does not know