Easiest Way to factorize in Python

factorize.py

'''
divmod() function is a handy tool in such cases. 
>>> divmod(10,2)
(5, 0)
'''
r = set()
def factorize(n):
  for i in range(1,int(n ** 0.5) + 1 ):
    div,mod = divmod(n,i)
    if mod == 0:
      r |= {i,div}
  return r