1%prog [options] 2%s option does not take a value 3Options 4Usage 5Usage: %s\n 6ambiguous option: %s (%s?) 7complex 8floating-point 9integer 10no such option: %s 11option %s: invalid %s value: %r 12option %s: invalid choice: %r (choose from %s) 13show program's version number and exit 14show this help message and exit