python - 如何统计使用beautiful soup检索到的代码行数？

Question

beautiful soup中有没有函数可以统计检索到的行数？或者还有其他方法可以做到这一点吗？

from bs4 import BeautifulSoup
import string
content = open("webpage.html","r")
soup = BeautifulSoup(content)
divTag = soup.find_all("div", {"class":"classname"})
for tag in divTag:
ulTags = tag.find_all("ul", {"class":"classname"})
for tag in ulTags:
  aTags = tag.find_all("a",{"class":"classname"})
  for tag in aTags:
   name = tag.find('img')['alt']
   print(name)

Answer 1

如果您想获取 find_all() 检索到的元素数量，尝试使用 len() 功能:

......
redditAll = soup.find_all("a")
print(len(redditAll))

更新:

您可以使用 CSS 选择器更改逻辑以一次性选择特定元素。这样，获取检索到的元素数量就像调用 len() 一样简单。函数的返回值:

imgTags = soup.select("div.classname ul.classname a.classname img")
#print number of <img> retreived :
print(len(imgTags))

for tag in imgTags:
    name = tag['alt']
    print(name)

或者您可以使用多个 for 循环来保留逻辑，并手动跟踪变量中的元素数量:

counter = 0

divTag = soup.find_all("div", {"class":"classname"})
for tag in divTag:
  ulTags = tag.find_all("ul", {"class":"classname"})
  for tag in ulTags:
    aTags = tag.find_all("a",{"class":"classname"})
    for tag in aTags:
     name = tag.find('img')['alt']
     print(name)
     #update counter:
     counter += 1

print(counter)