climate
This package contains some basic command line utilities for Python:
- one wrapper over
plac
for quick command-line argument processing - another for
logging
that lets us avoid copying that same horridlogging.basicConfig(...)
business in all of our scripts, and gives a sensible default logging style
Install either from this repository, or with pip:
pip install climate
Documentation for the package is at http://pythonhosted.org/climate.
Usage
At its most basic, just import the module into your script and use it to call your main function:
import climate import logging def main(foo=1, bar='hello'): logging.info('%s %s', foo, bar) if __name__ == '__main__': climate.call(main)
plac
wrapper
Automagically, the logging module will be configured for you! If you'd like to
set the values for main
from the command-line, just include an annotation (a
straight wrapper over plac
functionality):
import climate import logging @climate.annotate( foo=('value to use', 'option', None, int), bar=('greeting to offer', 'option'), ) def main(foo=1, bar='hello'): logging.info('%s %s', foo, bar) if __name__ == '__main__': climate.call(main)
argparse
wrapper
Finally, if you prefer using slightly more heavy-weight command line arguments,
climate
provides some convenience wrappers for you:
import climate import logging g = climate.add_group('Foo') g.add_argument('-a', '--alfred', type=int, default=2, help='ALFRED!') g.add_argument('-b', '--betty', type=int, default=3, help='BETTY!') def main(args): logging.info('%s %s', args.alfred, args.betty) if __name__ == '__main__': climate.call(main)
Then, as with using the plac
wrapper, calling your script with -h
or
--help
will give you command-line usage help for free! The usage in this
case will include a summary of the default value for each argument.
Unfortunately, at the moment if you mix the plac
wrapper with the
argparse
one, then confusing things happen. Just use one or the other. My
recommendation is to use the plac
wrapper for one-off scripts, and the
argparse
wrapper for anything that's likely to be turned into a library.
Argument files
If you're using the argparse
wrapper, climate
allows you to load
command-line arguments from a file, using the @filename
command-line
syntax:
python biochem-experiment.py --alfred 201 @experiment-01.args
Inside the argument file, lines starting with --
are automatically split
into multiple options, and lines not starting with --
are treated as a
single option. In addition, Python-style (aka shell-style) comments are ignored,
so you can keep your command-line arguments annotated with comments as needed.
If you need to include a literal hash #
character in your options for some
reason, just escape the hash by prefixing it with a backslash:
--flavor raspberry --color \#f39
License
The contents of log.py
were mostly written by Bryan Silverthorn
<bsilvert@cs.utexas.edu> as part of the utcondor package.
The other files are covered by the MIT license.