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A type safe dictionary in python

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A type safe dictionary class in python.


MIT. See License File.


params is on the Python Package Index (PyPI):

pip install py-params


Params instances are dict s for which default values could be provided as class level fields when subclassing Params. Those default values could than be overridden in instances of the class, by specifying the values in the constructor.

Accessing parameters not defined as class level variable would raise an AttributeError.

>>> from params import Params

>>> class TestParams(Params):
...     param_a = 'a'
...     param_b = True

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

>>> TestParams(param_a='c')                   ## override param_a
{'param_a': 'c', 'param_b': True}

>>> args.param_a = 2                          ## access as attribute or key
>>> args["param_a"] = 3
>>> args.param_a == args["param_a"]

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

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

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


As an illustration of how Params could be used to reduce boilerplate code check:

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