С предложенными изменениями, сделанными в комментариях, ваш код запускается.
from math import pi
from random import random, randint
def reproducing_rabbits(positions_rabbits_x, positions_rabbits_y):
angle = 2 * pi * random()
rabbits_angles = []
index = 0
for rabx in range(len(positions_rabbits_x)-1,-1,-1):
for rabx2 in range(len(positions_rabbits_x)):
# change or to and since it seems this should be based upon
# Manhattan distance (meaning if rabbit positions in x and y
# are within 1
if positions_rabbits_x[rabx] - positions_rabbits_x[rabx2] < 1 and positions_rabbits_y[rabx] - positions_rabbits_y[rabx2] < 1:
index += 1
if index == 1:
positions_rabbits_x.append(randint(1, 100))
positions_rabbits_y.append(randint(1,100))
rabbits_angles.append(angle)
index = 0
else:
index= 0
continue
return positions_rabbits_x, positions_rabbits_y, rabbits_angles
Тест
positions_rabbits_x = list(range(4))
positions_rabbits_y = list(range(4))
positions_rabbits_x, positions_rabbits_y, rabbits_angles = reproducing_rabbits(positions_rabbits_x, positions_rabbits_y)
print(f'Positions x {positions_rabbits_x}')
print(f'Positions y {positions_rabbits_y}')
print(f'Rabbits Angles {rabbits_angles}')
Выход
Positions x [0, 1, 2, 3, 67, 73, 29, 69, 99, 7, 11, 55, 18, 49, 81, 36, 79, 82, 87, 79, 16, 11, 62, 2, 49, 91, 15, 27, 47, 22]
Positions y [0, 1, 2, 3, 24, 85, 9, 19, 46, 34, 56, 25, 84, 24, 56, 86, 73, 71, 14, 68, 13, 62, 25, 83, 17, 90, 4, 41, 26, 20]
Rabbits Angles [6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789, 6.142160513085789]