2. What are nested dictionary? Give one example explaining the use of nested dictionary?
Example: dict of dict python
nested_dict = { 'dictA': {'key_1': 'value_1'},
'dictB': {'key_2': 'value_2'}}
nested_dict = { 'dictA': {'key_1': 'value_1'},
'dictB': {'key_2': 'value_2'}}