An exception can have an argument, which is a value that gives additional information about the problem. The contents of the argument vary from exception to exception. You capture an exception's argument by supplying a variable in the except clause as follows
try: b=float(56+78/0) except Exception, Argument: print 'This is the Argument\n', Argument
The output obtained is as follows
This is the Argument integer division or modulo by zero
If you write the code to handle a single exception, you can have a variable follow the name of the exception in the except statement. If you are trapping multiple exceptions, you can have a variable follow the tuple of the exception.
This variable receives the value of the exception mostly containing the cause of the exception. The variable can receive a single value or multiple values in the form of a tuple. This tuple usually contains the error string, the error number, and an error location.