Use udp to enter student information from the client and write the student information to a file on the server. Each student information is required to occupy one line of ID NAME AGE SCORE.

Receiving end

"""
使用udp，从客户端录入学生信息，在服务端将学生信息写入文件
要求每个学生信息占一行
ID  NAME  AGE  SCORE
"""

from socket import *
import struct

# 定义数据传输格式
st = struct.Struct('i28sif')

# 创建套接字接受内容
s = socket(AF_INET,SOCK_DGRAM)
s.bind(('0.0.0.0',8888))

# 打开文件
f = open('student.txt','a')

while True:
    data,addr = s.recvfrom(1024)

    # 将信息转换位元组数据 (1,b'lily',13,89.5)
    data = st.unpack(data)
    info = "%d  %-10s  %d  %.1f\n"%data
    f.write(info)
    f.flush()

f.close()
s.close()

发送端

```python
from socket import *
import struct

# 定义数据传输格式
st = struct.Struct('i28sif')

# 创建套接字接受内容
s = socket(AF_INET,SOCK_DGRAM)

# 服务端地址
ADDR = ('127.0.0.1',8888)

while True:
    print("================================")
    id = int(input("ID:"))
    name = input("Name:").encode()
    age = int(input("Age:"))
    score = float(input("Score:"))
    #数据打包
    data = st.pack(id,name,age,score)
    s.sendto(data,ADDR)