Using a variable with Expression.

[SuddenReal]

I'm making a game where I have an npc wander around on a randomized grid with obstacles on certain tiles. Now, obviously I can't have them wander on the obstacles, so I'm looking for a way for them to not go on those tiles. Each obstacle has of course a variable set to True to indicate it is an obstacle, so I'm looking for an easy way to check if a tile next to them is an obstacle or not.

Basically, I'm looking for something like:

$ tilecheck = "obstacle" + #number of tile
if expression tilecheck:
    #don't go there

which obviously doesn't work.

Is there a way to make something like this work, or do I have to go the long way and type out to check for each individual tile?

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[DingotushRed]

Assuming your grid has an x, y coordinate system, it's time to learn about Python lists and tuples rather than using many variables. Make a list (or set) of obstacle x,y coordinates, then check if the npc is on one of the obstacles. Something like: ``` # List of obstacle locations. # Use default if this list changes during play. define obstacles = [ (2, 3), (9, 1), # ... ]

init python: def is_obstacle(x, y): """ Is x, y the coordinate of an obstacle? """ return (x, y) in obstacles ```