import traceback def format_exception(exception): """Format an exception as diagnostics output. exception is the tuple as expected from sys.exc_info. """ exception_lines = traceback.format_exception(*exception) # The lines returned from format_exception do not strictly contain # one line per element in the list (i.e. some elements have new # line characters in the middle). Normalize that oddity. lines = "".join(exception_lines).splitlines(True) return format_as_diagnostics(lines) def format_as_diagnostics(lines): """Format the lines as diagnostics output by prepending the diagnostic #. This function makes no assumptions about the line endings. """ return "".join(["# " + line for line in lines])