On Mon, May 24, 2021 at 1:24 AM MRAB <python@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
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