python parse two level dict code example

Example 1: dict of dict python

nested_dict = { 'dictA': {'key_1': 'value_1'},
                'dictB': {'key_2': 'value_2'}}

Example 2: how to nested dictonary that condition

people = {1: {'name': 'John', 'age': '27', 'sex': 'Male'},
          2: {'name': 'Marie', 'age': '22', 'sex': 'Female'}}

people[3] = {}

people[1]['name'] = 'Luna'
people[1]['age'] = '24'
people[1]['sex'] = 'Female'
people[1]['married'] = 'No'

print(people[1])