Created
September 30, 2016 15:29
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Get value for a nested key, given a map list (list of keys to traverse)
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# 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}} |
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