namespace CatAnDog { abstract class Animal { public abstract void Shout(); public void Walk() { Console.WriteLine(“动物走路!”); } } class Cat:Animal { ...
from urllib import request from bs4 import BeautifulSoup url = r'http://www..com/' headers = {'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/...