如何在python中分解一个数字？

import time
# 对一个数进行因式分解
def factorization(num):
  factor = []
  while num > 1:
    for i in range(num - 1):
      k = i + 2
      if num % k == 0:
        factor.append(k)
        num = int(num / k)
        break
  return factor
st = time.perf_counter()
print(factorization(707829217))
et = time.perf_counter()
print("用时:", et - st)