Use try statement detects abnormal
as reason can be saved, what input the wrong time wrong reason should be converted into a string, or else also will complain oh
If you want to capture multiple setting error, write more except, or writing a single line
Of course, only output one exception occurs because the first statement that try to jump except go, and C # try catch as
But the try except we only catch exceptions set, except no exception is not caught, will still error!
If you want no matter what wrong have come except to go, it does not follow directly after except something like
But you can not know the error message , and therefore do not recommend this practice
raise himself an exception is thrown
