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Get_moves() function in dungeon_game

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)]

ā€¦ 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

1 Answer

Fable Turas
Fable Turas
9,405 Points

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).