traceback - Trace object. For example from sys.exc_info () .
Typically used as follows:
class MyException (Exception):
"" "Custom exception." ""
raise Exception (’Ruined.’)
except Exception :
traceback = sys.exc_info () 
raise MyException (’one’,’ two’) .with_traceback (traceback)
Raise a new one exception using the method in question, then the resulting trace will contain information about the exception that was originally raised.