如何使用美汤统计检索到的代码行数？

Question

beautiful soup有统计检索行数的函数吗？还是有其他方法可以做到这一点？

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

如果您想要获取 find_all() 检索到的元素数量，请尝试使用 len() 函数：

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

更新：

您可以一次性将逻辑更改为 select 特定元素，使用 CSS select 或。这样，获取检索到的元素数量就像在 return 值上调用 len() 函数一样简单：

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 循环来保持逻辑，并手动跟踪变量中元素的数量：

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)

如何使用美汤统计检索到的代码行数？

How to count the number of lines of code retrieved using beautiful soup?

python

printing

count

beautifulsoup