Python 3 web scraper 非常简单不工作

Question

我正在阅读一本“自学成才的程序员”一书，但遇到了一些 Python 代码问题。我让程序运行没有任何错误。问题是没有任何输出。

import urllib.request
from bs4 import BeautifulSoup


class Scraper:
    def __init__(self, site):
        self.site = site

    def scrape(self):
        r = urllib.request\
            .urlopen(self.site)
        html = r.read()
        parser = "html.parser"
        sp = BeautifulSoup(html, parser)
        for tag in sp.find_all("a"):
            url = tag.get("href")
            if url is None:
                continue
            if "html" in url:
                print("\n" + url)

news = "https://news.google.com/"
Scraper(news).scrape()

Answer 1

查看最后一个“if”语句。如果 url 中没有文本“html”，则不会打印任何内容。尝试删除它并取消缩进：

class Scraper:
    def __init__(self, site):
        self.site = site

    def scrape(self):
        r = urllib.request\
            .urlopen(self.site)
        html = r.read()
        parser = "html.parser"
        sp = BeautifulSoup(html, parser)
        for tag in sp.find_all("a"):
            url = tag.get("href")
            if url is None:
                continue
            print("\n" + url)