#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import socket

# 創建一個socket:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# 建立連接:
s.connect((‘www.sina.com.cn‘, 80))

# 發送數據:
s.send(b‘GET / HTTP/1.1\r\nHost: www.sina.com.cn\r\nConnection: close\r\n\r\n‘)

# 接收數據:
buffer = []
while True:
    # 每次最多接收1k字節:
    d = s.recv(1024)
    if d:
        buffer.append(d)
    else:
        break

data = b‘‘.join(buffer)

# 關閉連接:
s.close()

header, html = data.split(b‘\r\n\r\n‘, 1)
print(header.decode(‘utf-8‘))

# 把接收的數據寫入文件:
with open(‘sina.html‘, ‘wb‘) as f:
    f.write(html)
 

實現UDP連接

服務端：
#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import socket

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

# 綁定端口:
s.bind((‘127.0.0.1‘, 9999))

print(‘Bind UDP on 9999...‘)

while True:
    # 接收數據:
    data, addr = s.recvfrom(1024)
    print(‘Received from %s:%s.‘ % addr)
    reply = ‘Hello, %s!‘ % data.decode(‘utf-8‘)
    s.sendto(reply.encode(‘utf-8‘), addr)

客戶端：
#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import socket

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

for data in [b‘Michael‘, b‘Tracy‘, b‘Sarah‘]:
    # 發送數據:
    s.sendto(data, (‘127.0.0.1‘, 9999))
    # 接收數據:
    print(s.recv(1024).decode(‘utf-8‘))

s.close()
 

python網絡編程實現TCP和UDP連接