Excited cells challenge code for 300/300 in python3

exitedCells.py

for j in range(0, steps):
    tempState = []
    for i in range(0,len(initialState)):

        if len(initialState)-1 != i:
             right = initialState[i+1]
        else:
             right = initialState[0]

        if initialState[i-1] + right == 1:
            tempState.append(1)
        else:
             tempState.append(0)

    initialState = tempState

print(','.join([str(x) for x in initialState]))