Have you tried writing your own helper function `dig(d, *args)`? It should only take a few lines, and you can easily put that in a library of "utility" functions you carry around with you from project to project. Not everything needs to be built in!
On Thu, Aug 29, 2019 at 1:53 PM None via Python-ideas < python-ideas@python.org> wrote: > I did some searching to see if this has already been proposed before, but > didn't find any evidence that it has. If so, let me know and I'll go away > :) > > One of the tasks that I encounter frequently enough is retrieving a nested > key from a nested collection of dictionaries (a dictionary of dictionaries > that can be any number of layers deep). There are multiple ways of > tackling this, normally done with `reduce()`, iterative looping or chained > `get()`s and then handling `None`, `KeyError` or `AttributeError` > appropriately. I'd like to avoid this extra code and logic and have a > built-in method to facilitate this common data access pattern. > > I'd like to propose that we add a `dig()` method to dictionaries analogous > to Ruby's `dig()` method for Ruby Hashes (reference: > https://ruby-doc.org/core-2.6.0.preview2/Hash.html#method-i-dig). > Initially, I'd suggest that we only support nested dictionaries, but we > could also support lists and other collection types as Ruby does if we > really want to. Similar to the existing `get()` method on dictionaries, > I'd propose that the method return `None` if any of the keys in the chain > is not found, avoiding `KeyError`. > > Thoughts? > _______________________________________________ > Python-ideas mailing list -- python-ideas@python.org > To unsubscribe send an email to python-ideas-le...@python.org > https://mail.python.org/mailman3/lists/python-ideas.python.org/ > Message archived at > https://mail.python.org/archives/list/python-ideas@python.org/message/QFL76SGB562Q6C5N6ZWGNUXDIU5N7MKK/ > Code of Conduct: http://python.org/psf/codeofconduct/ > -- --Guido van Rossum (python.org/~guido) *Pronouns: he/him/his **(why is my pronoun here?)* <http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
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