How to update values in nested dictionary if keys are in a list? [duplicate]

Answer 1

I guess you can loop through your keys like this :

d = {}
a = d
for i in key_lst: 
    a[i] = {}
    if i == key_lst[-1]:
        a[i] = value
    else:
        a = a[i]
print(d)
# {'key1': {'key2': {'key3': 'my_value'}}}

Edit: I guess I misread the question and answered as if the dictionnary wasn't already existing. jpp answer is pretty neat otherwise I guess!