Any Functional Programming method of traversing a nested dictionary?

by

Use reduce():

reduce(dict.__getitem__, l, d)

or better still, using operator.getitem():

from operator import getitem

reduce(getitem, l, d)

Demo:

>>> d = {"a": {"b": {"c": 4}}} 
>>> l = ["a", "b", "c"]
>>> from operator import getitem
>>> reduce(getitem, l, d)
4

Python 3 moved the reduce() function out of the built-ins and into functools.reduce().

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