Le mer. 15 avr. 2020 à 05:02, Raymond Hettinger <raymond.hettin...@gmail.com> a écrit : > I would like to make that functionality available to the JSON module (or just > about anything else that accepts a custom dict) by adding the magic methods > for mappings so that this works: > > catalog = json.load(f, object_hook=SimpleNamespace) > print(catalog['clothing']['mens']['shoes']['extra_wide']['quantity']) > # currently possible with dict() > print(catalog.clothing.mens.shoes.extra_wide.quantity]) > # proposed with SimpleNamespace() > print(catalog.clothing.boys['3t'].tops.quantity > # would also be supported
It seems like there are many projects on PyPI which provide such features. A few examples: * https://pypi.org/project/attrdict/ "mapping objects that allow their elements to be accessed both as keys and as attributes" * https://pypi.org/project/dictlib/ "Dictionary keys as object attributes" * https://pypi.org/project/objdict/ "An ObjDict supports all normal dict operations, but adds support for accessing and setting entries as attributes" * https://pypi.org/project/mydict/ "dict subclass which tries to act like JavaScript objects, so you can use the dot notation (d.foo) to access members of the object" * https://pypi.org/project/dpath/ "accessing and searching dictionaries via /slashed/paths ala xpath". Example: dpath.util.search(x, "a/b/[cd]") * etc. There are many variants: * Support nested dictionaries or not * "Path" as a string ala XPath using "/" or "." separator -versus- don't give a direct access into nested dictionaries * Optional default value when a key/attribute is missing * etc. Is there a project on PyPI which already already been battle-tested and gained enough popularity to consider that it's now mature enough to enter the stdlib? The problem is that so far, I see no clear "winner" of a "standard" API. So maybe leaving such feature on PyPI is better for now. It seems like these projects are opinionated about what should be the "right" behavior :-) And yeah, there are even more advanced tools like https://glom.readthedocs.io/ As I wrote in the issue, I would prefer to leave SimpleNamespace unchanged. If such feature lands into the stdlib, I would prefer it to be a new class. Victor -- Night gathers, and now my watch begins. It shall not end until my death. _______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/XDFTMWK5727ETLVNEANWYN6A3HQN6STT/ Code of Conduct: http://python.org/psf/codeofconduct/
