sign_in_out

通过CS结构的客户端发送信息，服务端接收数据，记录在数据库，定期按需导出数据

Name		Name	Last commit message	Last commit date
Latest commit History 2 Commits
README.md		README.md
client.py		client.py
client_udp.py		client_udp.py
server_udp.py		server_udp.py
service.py		service.py
sign_in_db.py		sign_in_db.py
tk_test.py		tk_test.py

Provide feedback