2.8. 网络编程

2.8.1. tcp client

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

# 创建一个socket:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# 建立连接:
s.connect(('www.sina.com.cn', 80))
s.send(b'GET / HTTP/1.1\r\nHost: www.sina.com.cn\r\nConnection: close\r\n\r\n')
buffer = []
while True:
    # 每次最多接收1k字节:
    d = s.recv(1024)
    if d:
        buffer.append(d)
    else:
        break
data = b''.join(buffer)

s.close()

print(data)

2.8.2. tcp server

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import socket
import threading
import time 


def tcplink(sock, addr):
    print('Accept new connection from %s:%s...' % addr)
    sock.send(b'Welcome!')
    while True:
        data = sock.recv(1024)
        time.sleep(1)
        if not data or data.decode('utf-8') == 'exit':
            break
        sock.send(('Hello, %s!' % data.decode('utf-8')).encode('utf-8'))
    sock.close()
    print('Connection from %s:%s closed.' % addr)


s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(('127.0.0.1', 9999))
s.listen(5)
print('Waiting for connection...')

while True:
    # 接受一个新连接:
    sock, addr = s.accept()
    # 创建新线程来处理TCP连接:
    t = threading.Thread(target=tcplink, args=(sock, addr))
    t.start()

2.8.3. wsgi

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

from wsgiref.simple_server import make_server
# 导入我们自己编写的application函数:
def application(environ, start_response):
    start_response('200 OK', [('Content-Type', 'text/html')])
    return [b'<h1>Hello, web!</h1>']


# 创建一个服务器，IP地址为空，端口是8000，处理函数是application:
httpd = make_server('127.0.0.1', 8000, application)
print('Serving HTTP on port 8000...')
# 开始监听HTTP请求:
httpd.serve_forever()

2.8.4. flask

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

from flask import Flask

app = Flask(__name__)

@app.route("/")
def hello_world():
    return "<p>Hello, World!</p>"