TCP和UDP基本写法

TCP：长连接，安全可靠，一般不会丢包，但是会发生黏包，面向流的传输，长度没有限制，超长的数据包会被拆包发送

#server.py
import socket
sk = socket.socket()
sk.bind(("127.0.0.1",8080))
sk.listen()

conn,addr = sk.accept()
ret = conn.recv(1024)
print(ret.decode("utf-8"))
conn.send(b"server")

conn.close()
sk.close()
#client.py
import socket
sk = socket.socket()
sk.connect(("127.0.0.1",8080))

sk.send(b"clent")
ret = sk.recv(1024).decode("utf-8")

sk.close()

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UDP：短链接，不可靠，会发生丢包，不会黏包，面向消息，长度有限制，超过限制，超过的部分就不发送

#server.py
import socket
sk = socket.socket(type=socket.SOCK_DGRAM)
sk.bind(("127.0.0.1",8080))

msg,addr = sk.recvfrom(1024)
msg = msg.decode("utf-8")
print(msg)
sk.sendto(b"server",addr)

sk.close()
#client.py
import socket
sk = socket.socket(type=socket.SOCK_DGRAM)
ip_port = ("127.0.0.1",8080)

sk.sendto(b"client",ip_port)

msg,addr = sk.recvfrom(1024)
print(msg.decode("utf-8"))