%(option)s option requires %(number)d argument
%prog [options]
%s option does not take a value
Options
Usage
Usage: %s\n
ambiguous option: %s (%s?)
complex
floating-point
integer
no such option: %s
option %s: invalid %s value: %r
option %s: invalid choice: %r (choose from %s)
show program's version number and exit
show this help message and exit