Message366157
I have implemented a class in the C code of the collections module which has similar behavior to the defaultdict class. This class, dynamicdict, supplies values for keys that have not yet been added using a default factory callable, but unlike defaultdict, the missing key itself is passed to the callable. This code can be seen here: https://github.com/swfarnsworth/cpython/blob/3.8/Modules/_collectionsmodule.c#L2234
While this does introduce a lot of redundant code, I'm not sure how it could be done without copying the implementation of the defaultdict class and adjusting how the default factory is called. For example, I don't believe that it's possible to support both behaviors within the defaultdict class without breaking backwards compatibility or adding another parameter to the constructor for the defaultdict class.
I would be happy to further explain the concept, implementation, potential use cases, or anything else that might work towards the adoption of this feature. |
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2020-04-10 21:19:46 | Steele Farnsworth | set | recipients:
+ Steele Farnsworth |
2020-04-10 21:19:46 | Steele Farnsworth | set | messageid: <1586553586.38.0.834422539726.issue40248@roundup.psfhosted.org> |
2020-04-10 21:19:46 | Steele Farnsworth | link | issue40248 messages |
2020-04-10 21:19:46 | Steele Farnsworth | create | |
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