convertir en decimal a binario las fraccion 1/2

def frac_bin(num, den):
  # num, den = 1, 2
  bin_num = ''
  bin_den = ''
  while num >= 1 or den >= 1:
    # print(num)
    # print(den)
    if den % 2 == 0:
      bin_den += '0'
    else:
      bin_den += '1'
    if num % 2 == 0:
      bin_num += '0'
    else:
      bin_num += '1'
    num /= 2
    den /= 2
    
  return (bin_num, bin_den)

frac_bin(1, 2)