Python サーバー プログラミング: 初心者が学ばなければならない 5 つのヒント

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, request

app = 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!' % username

if __name__ == '__main__':
    app.run()

import asyncio

async 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_engine
from sqlalchemy.orm import sessionmaker

engine = 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(name='%s')>" % 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)

import logging

logging.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')