A type safe dictionary in python
Project description
A type safe dictionary class in python.
LICENSE
MIT. See License File.
Install
params is on the Python Package Index (PyPI):
pip install py-params
Usage
Param 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
>>> params=TestParams() ## using defaults
>>> params
{'param_a': 1, 'param_b': True}
>>> TestParams(param_a='c') ## override param_a
{'param_a': 'c', 'param_b': True}
>>> params.param_c
AttributeError: 'TestParams' object has no attribute 'test_b'
>>> params.param_c = 3
AttributeError: Setting unexpected parameter 'param_c' in Params instance 'TestParams'
>>> assert
{'param_a': 3, 'param_b': True}
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