如何将字符串转换为 BeautifulSoup 对象？

Question

我正在尝试抓取一个新闻网站，我需要更改一个参数。我用下一个代码替换它：

while i < len(links):
    conn = urllib.urlopen(links[i])
    html = conn.read()
    soup = BeautifulSoup(html)
    t = html.replace('class="row bigbox container mi-df-local locked-single"', 'class="row bigbox container mi-df-local single-local"')
    n = str(t.find("div", attrs={'class':'entry cuerpo-noticias'}))
    print(p)

问题是“t”类型是字符串，带有属性的查找只适用于类型<class 'BeautifulSoup.BeautifulSoup'>。你知道如何将“t”转换为那种类型吗？

Answer 1

只需在解析之前进行替换：

html = html.replace('class="row bigbox container mi-df-local locked-single"', 'class="row bigbox container mi-df-local single-local"')
soup = BeautifulSoup(html, "html.parser")

---

请注意，也可以（我什至会说首选）解析 HTML，定位元素并修改 @987654323 的属性 @实例，例如：

soup = BeautifulSoup(html, "html.parser")
for elm in soup.select(".row.bigbox.container.mi-df-local.locked-single"):
    elm["class"] = ["row", "bigbox", "container", "mi-df-local", "single-local"]

请注意，class 是一个特殊的 multi-valued attribute - 这就是我们将值设置为单个类列表的原因。

演示：

from bs4 import BeautifulSoup

html = """
<div class="row bigbox container mi-df-local locked-single">test</div>
"""

soup = BeautifulSoup(html, "html.parser")
for elm in soup.select(".row.bigbox.container.mi-df-local.locked-single"):
    elm["class"] = ["row", "bigbox", "container", "mi-df-local", "single-local"]

print(soup.prettify())

现在看看div 元素类是如何更新的：

<div class="row bigbox container mi-df-local single-local">
 test
</div>