Python list variables not getting modified by if-statement clauses -
i making game using langton's ant algorithm. want list tiles update number 0 in case... doesn't. why?
note: direction variable based on compass (n, e, w, s)
posx = 4 posy = 4 direction = 'w' tiles = [[1,1,1,1,1,1,1,1,1,1], [1,1,1,1,1,1,1,1,1,1], [1,1,1,1,1,1,1,1,1,1], [1,1,1,1,1,1,1,1,1,1], [1,1,1,1,1,1,1,1,1,1], [1,1,1,1,1,1,1,1,1,1], [1,1,1,1,1,1,1,1,1,1], [1,1,1,1,1,1,1,1,1,1], [1,1,1,1,1,1,1,1,1,1], [1,1,1,1,1,1,1,1,1,1]] def posision(posx, posy, tiles, direction): if tiles[posx][posy] == 1: tiles[posx][posy] = 0 if tiles[posx][posy] == 0: tiles[posx][posy] = 1 oldtiles = tiles if direction == 'n': if oldtiles[posx][posy] == 1: posx = posx+1 return 'w', tiles if oldtiles[posx][posy] == 0: posx = posx-1 return 'e', tiles if direction == 's': if oldtiles[posx][posy] == 0: posx = posx+1 return 'w', tiles if oldtiles[posx][posy] == 1: posx = posx-1 return 'e', tiles if direction == 'e': if oldtiles[posx][posy] == 1: posy = posy +1 return 'n', tiles if oldtiles[posx][posy] == 0: posy = posy -1 return 's', tiles if direction == 'w': if oldtiles[posx][posy] == 0: posy = posy +1 return 'n', tiles if oldtiles[posx][posy] == 1: posy = posy -1 return 's', tiles direction, tiles = posision(posx, posy, tiles, direction) print(tiles)
on line:
if tiles[posx][posy] == 1: tiles[posx][posy] = 0 if tiles[posx][posy] == 0: tiles[posx][posy] = 1 you saying:
if some_var 1 change 0 # i've changed 0 if some_var 0 # changing 1? change 1 i not sure if correct logic game? should change to:
if tiles[posx][posy] == 1: tiles[posx][posy] = 0 elif tiles[posx][posy] == 0: # else-if condition tiles[posx][posy] = 1 i recommend revisit flow control logics i.e. if-else ones see if explaination makes sense you. if-else sphagetti 1 of common problems made experts sometimes. figure out, it's okay.
an obvious 1 oldtiles modification inside if block further down code.
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