I know there's a similar question:
How to append to a dictionary of dictionaries
but the answers aren't working for me. My problem is as follows. If I need to add a new key: value pair to a Python dictionary, then
my_dict[key] = value
is always safe (as long as key is not a mutable type), whether my_dict had been already initialized or not.
However, if I want my_dict to be a dictionary of dictionaries, then
my_dict[keyA][keyB] = value
doesn't work, unless I already initialized my_dict[keyA] as an empty dictionary. So what I'm doing right now is:
class dict_of_dict():
def __init__(self):
self.ddict = {}
def update(self, keyA, keyB, value):
if not(keyA in self.ddict.keys()):
self.ddict[keyA] = {}
self.ddict[keyA][keyB] = value
a = dict_of_dict()
a.update(0, 3, "foobar")
a.ddict
This works, but I feel like it's overkill. Is there a more compact/Pythonic but still readable solution?
