Get value for a nested key, given a map list (list of keys to traverse)

gistfile1.py

# Taken from https://stackoverflow.com/questions/14692690/access-python-nested-dictionary-items-via-a-list-of-keys
#   Reproduced for my own benefit later

data_dict = {
    "a":{
        "r": 1,
        "s": 2,
        "t": 3
    },
    "b":{
        "u": 1,
        "v": {
            "x": 1,
            "y": 2,
            "z": 3
        },
        "w": 3
    }
} 

# Get a value from data_dict, given a list of keys to traverse
def get_from_dict(data_dict, map_list):
    return reduce(lambda d, k: d[k], map_list, data_dict)

# Create a key and set a value, at any deapth
def setInDict(data_dict, map_list, value):
    getFromDict(data_dict, map_list[:-1])[map_list[-1]] = value


>>> getFromDict(data_dict, ["a", "r"])
1
>>> getFromDict(data_dict, ["b", "v", "y"])
2
>>> setInDict(data_dict, ["b", "v", "w"], 4)
>>> import pprint
>>> pprint.pprint(data_dict)
{'a': {'r': 1, 's': 2, 't': 3},
 'b': {'u': 1, 'v': {'w': 4, 'x': 1, 'y': 2, 'z': 3}, 'w': 3}}