Objects are overkill. Use an iterable of getitem lookups. They compose easily and don’t have much overhead (cpu or cognitive). From the library I use at work, inspired by clojure.core/get-in, it would look like this:
def get_in(obj, lookup, default=None):
""" Walk obj via __getitem__ for each lookup,
returning the final value of the lookup or default.
"""
tmp = obj
for l in lookup:
try:
tmp = tmp[l]
except (KeyError, IndexError, TypeError):
return default
return tmp
data = {“foo”: {“bar”: [“spam”, “eggs”]}}
# find eggs
get_in(data, [“foo”, “bar”, 1])
By using __getitem__ you naturally work with anything in the python ecosystem.
