Python Advanced exception handling

Exception handling

When the code is running, bugs can occur for a variety of reasons, and the program will run out of trouble when it encounters a bug, while in daily production The program is not interrupted for long periods of time. Therefore, we need to do a good job of exception handling beforehand.

Abnormal

Print (x)  # General error will print a bunch of red errors

　　

Exception Handling: for more reasonable handling of code errors that may occur

Try:    Print(x)exceptNameerror as Error:Print('Error:%s'% error)#Error: Name ' x ' is not definedElse:    Print('no exception execution code for else')Print('the other code')#will execute normally

In the example above, the exception processing format is summarized as follows:

"""     Try:  The code generally puts some code that we think might be wrong    except error type:   Here you can use the as+ variable name to receive error message        error after executing code    It is common to write error messages into the log file ...              Multiple except can be written to determine a variety of error types else: Normal code code executing code "" ",        regardless of                 exception or not 

Special: Finally, usually in the function to do exception handling, and return encountered will also be normal execution, you can do some finishing work, such as: Close open files.

deffunc ():Try: F= Open ('Except_file','W') F.write ('Test')        returnTrueexcept:        returnFalsefinally:        Print('This is finally') F.close ()Print(Func ())

Special: Universal Exception Type: Exception

Try :     Print (i) except Exception as Error:     Print (' error:%s'% error) """     Although there is a universal exception handling mechanism, but can predict the exception is to be handled separately    and separate exception handling content to be before the almighty " " "

Python Advanced exception handling