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When i use this code:
 parser.add_argument('-r', '--range',
 action = 'store',
 dest = 'ranges',
 nargs = 2,
 metavar = 'RANGE',
 required = False,
 help = 'Start and end range date and time for report data.'\
 'Timeformat is %y-%m-%d %H:%M:%S'\
 'for example -r "2012-08-20 14:48:39 "2012-08-25 15:35:00"'
 )
I get this error:
Traceback (most recent call last):
 File "./create_report.py", line 166, in <module>
 main()
 File "./create_report.py", line 123, in main
 args = parser.parse_args()
 File "/usr/lib/python2.7/argparse.py", line 1688, in parse_args
 args, argv = self.parse_known_args(args, namespace)
 File "/usr/lib/python2.7/argparse.py", line 1720, in parse_known_args
 namespace, args = self._parse_known_args(args, namespace)
 File "/usr/lib/python2.7/argparse.py", line 1926, in _parse_known_args
 start_index = consume_optional(start_index)
 File "/usr/lib/python2.7/argparse.py", line 1866, in consume_optional
 take_action(action, args, option_string)
 File "/usr/lib/python2.7/argparse.py", line 1794, in take_action
 action(self, namespace, argument_values, option_string)
 File "/usr/lib/python2.7/argparse.py", line 994, in __call__
 parser.print_help()
 File "/usr/lib/python2.7/argparse.py", line 2313, in print_help
 self._print_message(self.format_help(), file)
 File "/usr/lib/python2.7/argparse.py", line 2287, in format_help
 return formatter.format_help()
 File "/usr/lib/python2.7/argparse.py", line 279, in format_help
 help = self._root_section.format_help()
 File "/usr/lib/python2.7/argparse.py", line 209, in format_help
 func(*args)
 File "/usr/lib/python2.7/argparse.py", line 209, in format_help
 func(*args)
 File "/usr/lib/python2.7/argparse.py", line 515, in _format_action
 help_text = self._expand_help(action)
 File "/usr/lib/python2.7/argparse.py", line 601, in _expand_help
 return self._get_help_string(action) % params
ValueError: unsupported format character 'y' (0x79) at index 65
i think that it sin't normal. i always cut strings like these, according to pep8 

The problem is the timeformat. % codes are used to include data into the strings, so if you want a literal % in the help string, you need to double it.

thanks!