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Dev/improve configurable documentation #406

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cbdf861
Add an example for overriding get_default_config
Mar 6, 2020
b7c8723
Update release notes
Mar 6, 2020
cc08242
Add suggested changes
Mar 6, 2020
8827dc2
Fix python 2.7 unit test failure
May 3, 2020
5272792
Merge branch 'master' into dev/improve-configurable-documentation
May 5, 2020
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2 changes: 2 additions & 0 deletions docs/release_notes/pending_release.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -12,3 +12,5 @@ Fixes
Documentation

* Add missing reference to v0.13.0 change notes.

* Add an example for overriding get_default_config
20 changes: 18 additions & 2 deletions python/smqtk/utils/configuration.py
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Expand Up @@ -60,10 +60,26 @@ def get_default_config(cls):
turning those argument names into configuration dictionary keys. If any
of those arguments have defaults, we will add those values into the
configuration dictionary appropriately. The dictionary returned should
only contain JSON compliant value types.
only contain JSON compliant value types. If the default arguments are
not json compliant then the function should be overriden to convert
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the convert the default to a json-compliant stand in.
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It is not be guaranteed that the configuration dictionary returned
from this method is valid for construction of an instance of this class.
>>> class NonCompliantDefault(Configurable):
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... def __init__(self, power_func=math.pow):
... self.power_func=power_func
... @classmethod
... def get_default_config(cls):
... default = super(NonCompliantDefault, cls).get_default_config()
... default['power_func'] = {'module': 'math',
... 'attribute': 'pow'}
... return default
>>> NonCompliantDefault.get_default_config()
{'power_func': {'module': 'math', 'attribute': 'pow'}}
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>>> import json
>>> json.dumps(NonCompliantDefault.get_default_config())
'{"power_func": {"module": "math", "attribute": "pow"}}'

:return: Default configuration dictionary for the class.
:rtype: dict
Expand Down Expand Up @@ -106,7 +122,7 @@ def from_config(cls, config_dict, merge_default=True):

This base method is adequate without modification when a class's
constructor argument types are JSON-compliant. If one or more are not,
however, this method then needs to be overridden in order to convert
this method then needs to be overridden in order to convert
from a JSON-compliant stand-in into the more complex object the
constructor requires. It is recommended that when complex types *are*
used they also inherit from the :class:`Configurable` in order to
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