BeautifulSoup循环不返回序列

Question

返回的结果不是按顺序排列，我需要按顺序返回结果。

试图记录排名。

def parse(self, response): 
    sourceHtml = BeautifulSoup(response.body) 
    soup = sourceHtml.find("dl", {"id": "resultList"}) 
    for link in soup.find_all('dd'): 
     print(link.get('code')) 

Answer 1

如果你想在列表中有印有“码”，只需使用一个"list comprehension"：

def parse(self, response): 
    sourceHtml = BeautifulSoup(response.body) 
    soup = sourceHtml.find("dl", {"id": "resultList"}) 
    return [link.get('code') for link in soup.find_all('dd')] 

您还可以改善你的定位元素的方式，并使用CSS selector：

def parse(self, response): 
    soup = BeautifulSoup(response.body) 
    return [link.get('code') for link in soup.select('dl#resultList dd')] 

这也是一个好主意，provide an underlying parser explicitly：

soup = BeautifulSoup(response.body, "html.parser") 
# or soup = BeautifulSoup(response.body, "html5lib") 
# or soup = BeautifulSoup(response.body, "lxml")