old_contents: x = {'name': 'Bob', 'job': 'janitor', 'agent': 47}
  
  x.update({'agent': 69})                             // This will update it from 47 to 69
  
  x['weapon'] = 'pistol'                              // This will add a new key inside the dictionary
  
  del x['name']                                       // This will delete specific key
  
  
new_contents: x = {'name': 'Bob', 'job': 'janitor', 'agent': 47}
  
  x.update({'agent': 69})                             // This will update it from 47 to 69
  
  x['weapon'] = 'pistol'                              // This will add a new key inside the dictionary
  
  del x['name']                                       // This will delete specific key
  
  y['name']['first']                                  // This will create main and sub key
  
  print(y)
  
  // y = 'name': {'first': ...}
  
subject: Update dict_update.py