Updating nested dictionaries when data has existing key

Question

I am trying to update values in a nested dictionary, without over-writting previous entries when the key already exists. For example, I have a dictionary:

Answer 1

myDict["myKey"]["nestedDictKey2"] = anotherValue

myDict["myKey"] returns the nested dictionary to which we can add another key like we do for any dictionary :)

Example:

>>> d = {'myKey' : {'k1' : 'v1'}}
>>> d['myKey']['k2'] = 'v2'
>>> d
{'myKey': {'k2': 'v2', 'k1': 'v1'}}