I recommend you take at look at the "toolz" library, which provides assorted APIs to help in data structure manipulation: https://toolz.readthedocs.io/en/latest/index.html
Especially this function: https://toolz.readthedocs.io/en/latest/api.html#toolz.dicttoolz.get_in Regards Antoine. On Thu, 29 Aug 2019 15:43:43 -0000 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/ > _______________________________________________ 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/X6WFTNRAT5BOHUW3PJHD46PHQC574KWN/ Code of Conduct: http://python.org/psf/codeofconduct/
