The pytoolz/cytoolz project already has this: https://toolz.readthedocs.io/en/latest/api.html#toolz.dicttoolz.get_in
On Sun, May 23, 2021, 11:44 Chris Angelico <ros...@gmail.com> wrote: > On Mon, May 24, 2021 at 1:24 AM MRAB <pyt...@mrabarnett.plus.com> wrote: > > Also, if the first lookup returns a list or a tuple, and an argument can > > be an index of that list, would be make sense to add a similar method to > > lists and tuples? > > Or, better: make it a stand-alone function, not a method of anything. > Although that kinda takes it out of python-ideas territory because it > could easily be a personal library function instead: > > _sentinel = object() # or see other proposals > def get_deep(obj, *keys, default=_sentinel): > if len(keys) == 1: keys = list(keys[0]) > try: > for key in keys: > obj = obj[key] > except (LookupError, TypeError): # the OP did include TypeError > if default is not _sentinel: return default > raise > return obj > > Done. Personally, I'd just go with "except LookupError:", but this is > another advantage of personal library functions: you don't have to > bikeshed them with everyone else :) > > ChrisA > _______________________________________________ > 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/YM6KCRUJV2ROYV2TC44DWECFJV6TG4A6/ > Code of Conduct: http://python.org/psf/codeofconduct/ >
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