<p>我有一个简单的beautifulsoup脚本,它定期从页面中提取数据,并将其保存为json文件。但是,每次运行时,它都会遍历许多相同的url集,并刮取许多相同的数据以及发布的任何新数据。如何避免重复</p>
<p>我尝试过对已经被刮去的url进行酸洗,但不知道如何构建逻辑来阻止刮去过程中不必要的重复</p>
<pre><code> for i in urlrange:
urlbase = 'https://www.example.com/press-releases/Pages/default.aspx?page='
targeturl = urlbase+str(i)
req = requests.get(targeturl)
r = req.content
soup = BeautifulSoup(r,'lxml')
for row in soup.find_all('table', class_='t-press'):
for link in row.find_all('a'):
link = link.get('href')
link = 'https://www.example.com' + link
if link not in datalinks:
datalinks.append(link)
#print('New link found!')
else:
continue
pickling_on = open("links_saved.pkl","wb")
pickle.dump(datalinks, pickling_on)
pickling_on.close()
for j in datalinks:
req = requests.get(j)
r = req.content
soup = BeautifulSoup(r,'lxml')
for textdata in soup.find_all('div', class_='content-slim'):
textdata = textdata.prettify()
data.append({j:textdata})
json_name = "Press_Data_{}.json".format(time.strftime("%d-%m-%y"))
with open(json_name,'w') as outfile:
json.dump(data,outfile)
</code></pre>
<p>我想刮的数据,而不必去的网址已经被脚本处理</p>