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Lightweight argument parsing using a decorator

Project description

Build status PyPI Version

Parsable is a lightweight decorator-based command line parser library. Parsable was written to be simpler than argparse, optparse, and argh.

Installation

Install from PyPI with pip

pip install parsable

Or just download parsable.py and add to your project.

Usage

Parsable uses just two pieces of syntax: a @parsable.command decorator, and a parsable.dispatch function.

  1. Import parsable.

    from parsable import parsable
    
  2. Decorate functions you want parsed. Parsable inspects the function to decide how to parse arguments. Arguments without default values are parsed as strings. Default arguments of any type T can be parsed as long as T(some_string) can do the parsing.

    @parsable
    def my_function(required_arg, optional_bool=True, optional_int=1):
        '''Help messages are not just a good idea, they are required'''
        # parsable automatically converts types based on default arguments:
        assert isinstance(required_arg, str)
        assert isinstance(optional_string, bool)
        assert isinstance(optional_int, int)
        # ...
    
    @parsable
    def do_stuff_with_files(*filenames, inplace=True):
        '''This does something to each file'''
        # ...
    
  3. Dispatch at the end of the script.

    if __name__ == '__main__':
        parsable()
    
  4. Use your new script

    $ python my_script.py my_function demo optional_int=5
    ...
    
    # parsable replaces - with _ to make functions easier to read
    $ python my_script.py do-stuff-with-files *.py in-place=false
    ...
    

LICENSE

Parsable is dual-licensed under the MIT and GPL2 licenses.

Project details


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Files for parsable, version 0.2.0
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