Opster is a command line options parser, intended to make writing command line
applications easy and painless. It uses built-in Python types (lists,
dictionaries, etc) to define options, which makes configuration clear and
concise. Additionally it contains possibility to handle subcommands (i.e.
hg commit or
Supported Python versions: Python >= 2.6 (including 3.x)
That's an example of an option definition
import sys from opster import command @command() def main(message, no_newline=('n', False, "don't print a newline")): '''Simple echo program''' sys.stdout.write(message) if not no_newline: sys.stdout.write('\n') if __name__ == '__main__': main.command()
Running this program will print help message:
> ./echo.py echo.py: invalid arguments echo.py [OPTIONS] MESSAGE Simple echo program options: -n --no-newline don't print a newline -h --help show help
As you can see, here we have defined option to not print newline: keyword argument name is a long name for option, default value is a 3-tuple, containing short name for an option (can be empty), default value (on base of which processing is applied - see description) and a help string.
Underscores in long names of options are converted into dashes.
If you are calling a command with option using long name, you can supply it
partially. In this case it could look like
./echo.py --no-new. This is also
true for subcommands: read about them and everything else you'd like to know in