Python Moving between rooms with a Dictions

Question

I'm working on a coding project for class, which requires the user to be able to move between rooms. I'm having an issue with one specific part of the code. I can't figure out how to pull the room name from the dictionary. I can get the rest to work. The line I need help with is "('You are in the {}.'.format(player_room[]))". Here is my code:

rooms = {
    'Great Hall': {'South': 'Bedroom'},
    'Bedroom': {'North': 'Great Hall', 'East': 'Cellar'},
    'Cellar': {'West': 'Bedroom'}
}

while player_move != 'Exit':
if player_move in moves:
if player_move in player_room:
   player_room = rooms[player_room[player_move]]
   print('You are in the {}.'.format(player_room[]))
   print('Enter a move:')
   player_move = input()
 elif player_move not in player_room:
    print('Invalid move.')
    print('Enter a move:')
    player_move = input()