how to write the condition if the dictionary has nested dic in python code example

Example: 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])