网络编程

TCP server

import socket

s= socket.socket(socket.AF_INET,socket.SOCK_STREAM)

s.bind(('127.0.0.1',4567))

s.listen(5) #5:连接的最大数量

sock,addr = s.accept()

sock.send(b'Welcome!')

data = sock.recv(1024)

sock.close()

TCP client

importsocket

s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)

s.connect(('127.0.0.1',4567))

s.recv(1024).decode('utf-8')

s.send('abcd')

s.close()

UDP server

import socket

s = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)

s.bind(('127.0.0.1',9999))

data,addr = s.recvfrom(1024)

s.sendto(b'Hello, %s!'% data,addr)

UDP client

importsocket

s = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)

s.sendto('VanCare',('127.0.0.1',9999))

s.recv(1024).decode('utf-8')

s.close()