How do I use nested dictionaries in Python?

How do I use nested dictionaries in Python?

You can create a nested dictionary by placing one dictionary inside another. For example: {'key1': {'subkey1': 'value1'}}.

Can you show me an example of accessing a value in a nested dictionary?

Sure! If you have a dictionary like this: data = {'person': {'name': 'Alice', 'age': 30}}, you can access the name with data['person']['name'].

What if I want to add a new key-value pair to the nested dictionary?

You can add a new key-value pair by simply assigning a value to a new key. For example: data['person']['city'] = 'New York'.

How can I loop through all the keys and values in a nested dictionary?

You can use a nested loop. For example:

for key, value in data.items():
    for subkey, subvalue in value.items():
        print(subkey, subvalue)