import requests import threading from queue import Queue # 定义要爬取的 URL 队列 url_queue = Queue() # 初始化一些示例 URL urls = [ 'https://example1.com', 'https://example2.com', 'https://example3.com' ] for url in urls: url_queue.put(url) # 爬虫函数 def crawl(url): respons...
Class and Object ProgramsPython example to define a class Python | Demonstrate an example of Class and Object Python | Simple program of a class (Input and print a number) Public variables in Python Python | Create Employee class with some attributes and methods More »...
This is a very simple example script to publish to a topic, and then receive the published message. To do that we will need to first subscribe to the topic and then publish messages to the same topic. We will publish and subscribe using the same client. The Code import time import paho...
Example: Simple Calculator by Using Functions # This function adds two numbers def add(x, y): return x + y # This function subtracts two numbers def subtract(x, y): return x - y # This function multiplies two numbers def multiply(x, y): return x * y # This function divides two ...
主要章节和小节重新按照如下逻辑划分: 一、Python基础 1 数字 2 字符串 3 列表 4 流程控制 5 编程风格 6 函数 7 输入和输出 8 数据结构 9 模块 10 错误和异常 11 类和对象 二、Python模块 1 时间模块 2 文件操作 3 常见迭代器 4 yield 用法 5 装饰
If your program is relatively simple, then you only need to supply the name of your Python file, and an optional icon file.Here is an example session showing only the .pyw file and the .ico file being supplied.Additional Back-endsCurrently in the works is support for additional back-ends...
It's as simple as change the variable to the following: doughnuts_exist = False To put it all together: Kids would use variables to store different types of data that they can use later in their programs: string_variable = "value" ...
Directories inPATHare searched from left to right, so a matching executable in a directory at the beginning of the list takes precedence over another one at the end. In this example, the/usr/local/bindirectory will be searched first, then/usr/bin, then/bin. ...
("测试文件写入")) f.close # example2 # a写入,文件存在,则在文件内容后追加写入,不存在则创建 f = open(r"./data/test.txt", "a", encoding="utf-8") print(f.write("测试文件写入")) f.close # example3 # with关键字系统会自动关闭文件和处理异常 with open(r"./data/test.txt", "w")...
Virtual environments prevent the issue of running into dependency issues later on. For example, in older projects you might have worked with older versions of thenumpylibrary. Some old code, that once worked beautifully, might stop working once you update its version. Perhaps parts ofnumpyare no...