Python實現採集wordpress整站數據的爬蟲

最近愛上了python,就很是喜歡使用python來練手,在上次的基礎上完善一下代碼,實現採集wordpress程序的網站的整站數據的爬蟲程序,本站也是採用的wordpress,我就拿吾八哥網(http://www.5bug.wang/)來練手了!簡單分析下這個爬蟲的思路,從首頁開始,抓取href標籤,到子頁面後仍是要繼續找href標籤,那麼很容易想到要用到遞歸了,直接貼代碼吧!寫了點簡單的註釋,以下:html

import re
import bs4
import urllib.request

url_home = 'http://www.5bug.wang/'  #要採集的網站
url_pattern = url_home + '([\s\S]*)\.html' #正則表達式匹配文章頁面,此處需完善爲更好的寫法
url_set = set()
url_cache = set()
url_count = 0
url_maxCount = 1000  #最大采集數量

#採集匹配文章內容的href標籤
def spiderURL(url, pattern):
    html = urllib.request.urlopen(url).read().decode('utf8')
    soup = bs4.BeautifulSoup(html, 'html.parser')
    links = soup.find_all('a', href = re.compile(pattern))
    for link in links:
        if link['href'] not in url_cache:
            url_set.add(link['href'])
    return soup

#採集的過程  異常處理還須要完善,對於一些加了防採集的站,還須要處理header的,下次咱們再學習
spiderURL(url_home, url_pattern)

while len(url_set) != 0:
    try:
        url = url_set.pop()
        url_cache.add(url)
        soup = spiderURL(url, url_pattern)
        page = soup.find('div', {'class':'content'})

        title = page.find('h1').get_text()
        autor = page.find('h4').get_text()
        content = page.find('article').get_text()

        print(title, autor, url)
    except Exception as e:
        print(url, e)
        continue
    else:
        url_count += 1
    finally:
        if url_count == url_maxCount:
            break

print('一共採集了: ' + str(url_count) + ' 條數據')
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