tmp_num = self.id + 1000000
nums = map(int, '%07d' % tmp_num)
factors = map(int, '123456')
result = sum(
map(lambda args: args[0] * args[1], zip(factors, nums))) % 11
if result == 0:
salt = 5
elif result == 1:
salt = 0
else:
salt = 11 - result
number = "DD{:07d}{}".format(tmp_num, salt)
例如会生成 DD10013782
生成出来的订单号不长,也不会重复,好奇什么样的逻辑?