[Python] How to iterate through a nested dict?

I have a nested python dictionary data structure. I want to read its keys and values without using collection module. The data structure is like bellow.

d = {'dict1': {'foo': 1, 'bar': 2}, 'dict2': {'baz': 3, 'quux': 4}}


I was trying to read the keys in the dictionary using the bellow way but getting error.

Code

for key, value in d:
print(Key)


Error

ValueError: too many values to unpack (expected 2)


So can anyone please explain the reason behind the error and how to iterate through the dictionary.

Continue reading...