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Stuck in while loop (with conditions) while iterating over 2D Array (Python) [closed]

I am writing a program that simulates simple evolution. The world map is a 20x20 array. Each field can either be a 0 (empty) a 1 (organism at these coordinates) or a 2 (food at these coordinates).

Within a function that calculates reproduction of each organism, there is a while loop that should recalculate the coordinates to place the offspring (the new organism). It checks if the random field that spawns the kid is already occupied, if so, then it choses new random coordinates until it found an empty field on the array (that means an array element that is 0):

for i in range(kids):
                    exec(f"organism{i} = Organism()")
                    x = random.randint(2,17)
                    y = random.randint(2,17)
                    try:
                        while world[x][y] == 1 or world[2][2] == 2:
                            x = random.randint(2,17)
                            y = random.randint(2,17)
                    except:
                        print("CRITICAL ERROR: Could not find coordinates for offspring.")

What happens is that the program gets stuck in exactly that loop forever unless I stop execution in which case I get the except promt (CRITICAL ERROR).

Now I tried around for many hours but I cant fix it. I can definately tell you that the problem is not that there are no empty fields (zeroes) available. The problem occurs randomly, sometimes right at the first iteration of the main loop, sometimes a bit later. But once it happens, the error occurs for ALL iterations of the for i in range(kids) loop, not just for a single one. So it definately acts like there are no empty fields available, even tho there are plenty.

Here an output where the error occurs, with the world map printed out, showing that there are many empty fields (zeroes) to choose from.

---------- Iteration  3  ----------
[0, 0, 0, 1, 0, 0, 2, 0, 0, 2, 0, 0, 0, 2, 2, 0, 2, 0, 0, 2]
[0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 2, 2, 0, 0, 2, 0, 0, 2]
[0, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 2, 0]
[0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 2, 0, 0]
[0, 0, 0, 2, 0, 2, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0]
[0, 0, 0, 0, 2, 0, 2, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 2]
[0, 0, 0, 0, 2, 0, 0, 2, 0, 2, 2, 0, 0, 2, 0, 0, 0, 0, 0, 0]
[0, 0, 0, 0, 1, 2, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0]
[2, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
[0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0]
[0, 0, 0, 0, 0, 2, 0, 2, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0]
[0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0]
[0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 2, 0, 0]
[2, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
[2, 0, 2, 0, 2, 2, 0, 0, 0, 2, 0, 0, 1, 0, 0, 0, 2, 2, 0, 0]
[2, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 2]
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 2, 0]
[0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 2]
[0, 0, 0, 0, 0, 1, 2, 0, 0, 0, 0, 0, 2, 2, 0, 0, 0, 0, 0, 0]
[0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
18 Organisms are dead
CRITICAL ERROR: Could not find coordinates for offspring.
CRITICAL ERROR: Could not find coordinates for offspring.
CRITICAL ERROR: Could not find coordinates for offspring.

What can I try next?



source https://stackoverflow.com/questions/76246455/stuck-in-while-loop-with-conditions-while-iterating-over-2d-array-python

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