Get_moves() function in dungeon_game

Question

Hi guys, 
I would appreciate it if someone could answer me the following question. As I am new to programming, my understanding so far is, that the body within an if-statement is only executed iff the condition of the if-statement is true, isn't? 
In the dugeon_game we define the cells constant as follows: 
CELLS = [(0, 0), (0, 1), (0, 2),(1, 0), (1, 1), (1, 2),(2, 0), (2, 1), (2, 2)]
… now we define the get_moves() function as follows: 
***def get_moves(player):
 moves = ['LEFT', 'RIGHT', 'UP', 'DOWN']
  if player[1] == 0:
    moves.remove('LEFT')
  if player[1] == 2:
    moves.remove('RIGHT')
  if player[0] == 0:
    moves.remove('DOWN')
  if player[0] == 2:
    moves.remove('UP')
  return moves***
So when we check  if player[1] == 0 , we are actually checking the if (0,1) == 0  isn't like that? When will this be true? 
Thanks for your help guys :-) 
Cheers
Urs

Fable Turas · Answer

Each CELLS unit is a tuple of x and y coordinates. As I recall, somewhere else in the game program there is a function that assigns 'player' to a random choice from the list of tuples in CELLS.
So 'player' would equal (0, 1), or some other appropriate tuple from the CELLS list. 
To better understand when player[1] == 0 you might want to review the videos that talk about referencing members of a list or tuple by its index.  
In an example where 'player' is equal to (1, 2), 'player[0]', or the member of 'player' at index 0, equals 1 and 'player[1]', or the member of 'player' at index 1, equals 2.  So player[1] == 0 would be true any time 'player' equals (0, 0) or (1, 0) or (2, 0).

Welcome to the Treehouse Community

Looking to learn something new?

Urs Merkel

Urs Merkel

Get_moves() function in dungeon_game

1 Answer

Fable Turas

Fable Turas