Python服务器编程：初学者必须学会的5个技巧

import socket# 创建一个Socket实例server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)# 绑定地址和端口号server_socket.bind(("", 8000))# 监听连接server_socket.listen(10)while True:    # 等待连接    client_socket, client_address = server_socket.accept()        # 接收数据    data = client_socket.recv(1024)        # 处理数据    response = "Hello, %s" % data.decode()        # 发送响应    client_socket.sendall(response.encode())        # 关闭连接    client_socket.close()

from flask import Flask, requestapp = Flask(__name__)@app.route('/')def home():    return 'Hello, World!'@app.route('/about')def about():    return 'This is a Flask web application.'@app.route('/user/<username>')def user(username):    return 'Hello, %s!' % usernameif __name__ == '__main__':    app.run()</username>

import asyncioasync def hello():    print('Hello')    await asyncio.sleep(1)    print('World')async def main():    await asyncio.gather(hello(), hello(), hello())if __name__ == '__main__':    asyncio.run(main())

from sqlalchemy import create_enginefrom sqlalchemy.orm import sessionmakerengine = create_engine('sqlite:///example.db')Session = sessionmaker(bind=engine)class User(Base):    __tablename__ = 'users'        id = Column(Integer, primary_key=True)    name = Column(String)        def __repr__(self):        return "<user>" % self.name    # 创建表Base.metadata.create_all(engine)# 添加数据session = Session()new_user = User(name='John')session.add(new_user)session.commit()# 查询数据users = session.query(User).all()for user in users:    print(user)</user>

import logginglogging.basicConfig(    level=logging.DEBUG,    format='%(asctime)s [%(levelname)s] %(message)s',    handlers=[        logging.FileHandler('app.log'),        logging.StreamHandler()    ])logging.debug('This is a debug message')logging.info('This is an info message')logging.warning('This is a warning message')logging.error('This is an error message')logging.critical('This is a critical message')