How to convert a String into a BeautifulSoup objec

问题:

I'm trying to crawl a news website and I need to change one parameter. I changed it with replace with the next code:

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)

The problem is that "t" type is string and find with attributes is only applicable to types <class 'BeautifulSoup.BeautifulSoup'>. Do you know how can I convert "t" to that type?

回答1:

Just do the replacement before parsing:

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")

---

Note that it would also be possible (I would even say preferred) to parse the HTML, locate the element(s) and modify the attributes of a Tag instance, e.g.:

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"]

Note that class is a special multi-valued attribute - that's why we are setting the value to a list of individual classes.

Demo:

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())

Now see how the div element classes were updated:

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