Thanks in advance.
I am wriiting a code about Conway's game of life,and i am a beginner of python,have looked at my code for hours,still couldnt find out the bug...when i run it,it doesnt work....only return the same matrix as the test code given..anybody can help with check it would be very helpful.
here is my 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=0
            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
            
            if universe_array[iy,ix]==0 and neighbours==3:
                evolved_array[iy,ix]==1
            if universe_array[iy,ix]==1 and neighbours<2:
                evolved_array[iy,ix]==0
            if universe_array[iy,ix]==1 and neighbours>3:
                evolved_array[iy,ix]==0
            if universe_array[iy,ix]==1 and (neighbours==2 or neighbours==3):
                evolved_array[iy,ix]=universe_array[iy,ix]
                            
    return evolved_array




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

Nice code. Almost there. Here's a hint: evolved_array[iy,ix]==1 does NOT assign any value to evolved_array[iy,ix] . But you seem to be trying to do that. Blame it on your editor...

Nice code. Almost there. Here's a hint: evolved_array[iy,ix]==1 does NOT assign any value to evolved_array[iy,ix] . But you seem to be trying to do that. Blame it on your editor...

Thanks for BearofNH!!!i sort it~~~~~~~~~~~~~~

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