>>> import params as pp

>>> class TestParams(pp.Params):
...     param_a = 1
...     param_b = True

>>> params = TestParams()                     ## using the defaults
>>> params
{'param_a': 1, 'param_b': True}

>>> TestParams(param_a=2)                     ## setting a value for param_a
{'param_a': 2, 'param_b': True}

>>> params.param_a = 3                          ## access as attribute or key
>>> params["param_a"] = 4
>>> params.param_a == params["param_a"]
True

>>> params.param_c
AttributeError: 'TestParams' object has no attribute 'test_c'

>>> params.param_c = 3
AttributeError: Setting unexpected parameter 'param_c' in Params instance 'TestParams'

>>> params["param_d"] = 4
AttributeError: Setting unexpected parameter 'param_d' in Params instance 'TestParams'

>>> import params as pp

>>> class TestParams(pp.Params):
...     number_of_things = pp.Param(None, doc="Specifies the number of things", dtype=int, required=True)
...     use_feature_x    = pp.Param(True, doc="whether to use feature X")
>>> parser = TestParams.to_argument_parser()
>>> parser.print_help()
usage: pydevconsole.py [-h] --number-of-things NUMBER_OF_THINGS
                       [--use-feature-x [USE_FEATURE_X]]

optional arguments:
  -h, --help            show this help message and exit
  --number-of-things NUMBER_OF_THINGS
                        Specifies the number of things
  --use-feature-x [USE_FEATURE_X]
                        whether to use feature X
>>> args = parser.parse_known_args(["--number-of-things", "7"])
>>> TestParams(args._get_kwargs())
{'number_of_things': 7, 'use_feature_x': True}