code: import time
  from numba import jit
  import numpy as np 
  
  @jit()
  def jit_sum_conbination(N):
      xs = [i for i in range(N)]
      ys = [i for i in range(N)]
      total = 0
      for x in xs:
          for y in ys:
              total += x+y
      return total
  
  def py_sum_conbination(N):
      xs =  np.arange(N)
      ys =  np.arange(N)
      total = 0
      for x in xs:
          for y in ys:
              total += x+y
      return total
  
  def main():
      N = 10000
      start = time.time()
      total = jit_sum_conbination(N)
      end = time.time()
      print(total)
      print('elapsed time=', end-start)
  
  if __name__ == '__main__':
      main()
  
apis: numpy.arange