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POProblem with Python implementation of Conway's Game of Life
 

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  1. POProblem with Python implementation of Conway's Game of Life
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    <p>I am working on <a href="http://en.wikipedia.org/wiki/Conway%27s_Game_of_Life" rel="nofollow noreferrer">Conway's Game of Life</a> currently and have gotten stuck. My code doesn't work.</p> <p>When I run my code in GUI, it says:</p> <pre> [[0 0 0 0] [0 1 1 0] [0 1 0 0] [0 0 0 0]] Traceback (most recent call last): File "C:\Users\Documents\Physics\Python\MainProject\conway.py", line 53, in b= apply_rules(a) File "C:\Users\Documents\Physics\Python\MainProject\conway.py", line 14, in apply_rules neighbours=number_neighbours(universe_array,iy,ix) File "C:\Users\Documents\Physics\Python\MainProject\conway.py", line 36, in number_neighbours neighbours+=1 UnboundLocalError: local variable 'neighbours' referenced before assignment </pre> <p>Here is my code:</p> <pre><code>'''If a cell is dead at time T with exactly three live neighbours, the cell will be alive at T+1 If a cell is alive at time T with less than two living neighbours it dies at T+1 If a cell is alive at time T with more than three live neighbours it dies at T+1 If a cell is alive at time T with exactly two or three live neighbours it remains alive at T+1''' import numpy def apply_rules (universe_array): height, width = universe_array.shape # create a new array for t+1 evolved_array = numpy.zeros((height, width),numpy.uint8) for iy in range(1, height-1): for ix in range(1,width-1): neighbours=number_neighbours(universe_array,iy,ix) if universe_array[iy,ix]==0 and neighbours==3: evolved_array[iy,ix]==1 elif universe_array[iy,ix]==1 and neighbours&lt;2: evolved_array[iy,ix]==0 elif universe_array[iy,ix]==1 and neighbours&gt;3: evolved_array[iy,ix]==0 elif universe_array[iy,ix]==1 and neighbours==2 or neighbours==3: evolved_array[iy,ix]=universe_array[iy,ix] return evolved_array def number_neighbours(universe_array,iy,ix): neighbours=0 #fixed this line,thanks:) if universe_array[iy-1,ix-1]==1: neighbours+=1 if universe_array[iy,ix-1]==1: neighbours+=1 if universe_array[iy+1,ix-1]==1: neighbours+=1 if universe_array[iy-1,ix]==1: neighbours+=1 if universe_array[iy+1,ix]==1: neighbours+=1 if universe_array[iy-1,ix+1]==1: neighbours+=1 if universe_array[iy,ix+1]==1: neighbours+=1 if universe_array[iy+1,ix+1]==1: neighbours+=1 else: neighbours=neighbours return neighbours if __name__ == "__main__": a = numpy.zeros((4,4),numpy.uint8) a[1,1]=1 a[1,2]=1 a[2,1]=1 print a b= apply_rules(a) print b </code></pre> <p>I am a beginner at Python, and I don't know how to fix the error. I am a little bit confused about <code>import "neighbours"</code> to <code>function "apply_rules"</code>, is that right way to do this?</p>
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    1. USPeter Mortensen
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    1. COcode should be indented and separated by a white-space line in order to be formatted
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    2. COYou might get faster help if you explain exactly how you are "stuck".
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    3. CO@EBGreen I was thinking the same thing. What is not working as you expect it and how do you expect it to work?
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      1. USUnkwnTech
 

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