Declaring a multi dimensional dictionary in python

Question

I need to make a two dimensional dictionary in python. e.g. new_dic[1][2] = 5

When I make new_dic = {}, and try to insert values, I get a <

Answer 1

u can try this, it is even easier if it is string

new_dic = {}
a = 1
new_dic[a] = {}
b = 2
new_dic[a][b] = {}
c = 5
new_dic[a][b]={c}

type

new_dic[a][b]
>>>'5'

For string

new_dic = {}
a = "cat"
new_dic[a] = {}
b = "dog"
new_dic[a][b] = {}
c = 5
new_dic[a][b] = {c}

type

new_dic["cat"]["dog"]
>>>'5'

Answer 2

Check it out:

def nested_dict(n, type):
    if n == 1:
        return defaultdict(type)
    else:
        return defaultdict(lambda: nested_dict(n-1, type))

And then:

new_dict = nested_dict(2, float)

Now you can:

new_dict['key1']['key2'] += 5

You can create as many dimensions as you want, having the target type of your choice:

new_dict = nested_dict(3, list)
new_dict['a']['b']['c'].append(5)

Result will be:

new_dict['a']['b']['c'] = [5]