from util.subprocess import register
reg = register()
f = open('code.txt', 'w') #清空文件内容再写
f.write(reg.getCombinNumber()) #只能写字符串
f.close()

#F4:8E:38:99:38:28BFEBFBFF000306C3WD-WCC6Z6DFR1S6/5257GD2/CN70163654032M/