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對Python3 解析html的幾種操作方式小結(jié)

更新時(shí)間：2019年02月16日 14:42:44 作者：極客點(diǎn)兒

今天小編就為大家分享一篇對Python3 解析html的幾種操作方式小結(jié)，具有很好的參考價(jià)值，希望對大家有所幫助。一起跟隨小編過來看看吧

解析html是爬蟲后的重要的一個(gè)處理數(shù)據(jù)的環(huán)節(jié)。一下記錄解析html的幾種方式。

先介紹基礎(chǔ)的輔助函數(shù)，主要用于獲取html并輸入解析后的結(jié)束

#把傳遞解析函數(shù)，便于下面的修改
def get_html(url, paraser=bs4_paraser):
 headers = {
  'Accept': '*/*',
  'Accept-Encoding': 'gzip, deflate, sdch',
  'Accept-Language': 'zh-CN,zh;q=0.8',
  'Host': 'www.360kan.com',
  'Proxy-Connection': 'keep-alive',
  'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36'
 }
 request = urllib2.Request(url, headers=headers)
 response = urllib2.urlopen(request)
 response.encoding = 'utf-8'
 if response.code == 200:
  data = StringIO.StringIO(response.read())
  gzipper = gzip.GzipFile(fileobj=data)
  data = gzipper.read()
  value = paraser(data) # open('E:/h5/haPkY0osd0r5UB.html').read()
  return value
 else:
  pass
 
 
value = get_html('http://www.360kan.com/m/haPkY0osd0r5UB.html', paraser=lxml_parser)
for row in value:
 print row

1，lxml.html的方式進(jìn)行解析，

The lxml XML toolkit is a Pythonic binding for the C libraries libxml2 and libxslt. It is unique in that it combines the speed and XML feature completeness of these libraries with the simplicity of a native Python API, mostly compatible but superior to the well-known ElementTree API. The latest release works with all CPython versions from 2.6 to 3.5. See the introduction for more information about background and goals of the lxml project. Some common questions are answered in the FAQ. [官網(wǎng)](http://lxml.de/)

def lxml_parser(page):
 data = []
 doc = etree.HTML(page)
 all_div = doc.xpath('//div[@class="yingping-list-wrap"]')
 for row in all_div:
  # 獲取每一個(gè)影評，即影評的item
  all_div_item = row.xpath('.//div[@class="item"]') # find_all('div', attrs={'class': 'item'})
  for r in all_div_item:
   value = {}
   # 獲取影評的標(biāo)題部分
   title = r.xpath('.//div[@class="g-clear title-wrap"][1]')
   value['title'] = title[0].xpath('./a/text()')[0]
   value['title_href'] = title[0].xpath('./a/@href')[0]
   score_text = title[0].xpath('./div/span/span/@style')[0]
   score_text = re.search(r'\d+', score_text).group()
   value['score'] = int(score_text) / 20
   # 時(shí)間
   value['time'] = title[0].xpath('./div/span[@class="time"]/text()')[0]
   # 多少人喜歡
   value['people'] = int(
     re.search(r'\d+', title[0].xpath('./div[@class="num"]/span/text()')[0]).group())
   data.append(value)
 return data

2，使用BeautifulSoup，不多說了，大家網(wǎng)上找資料看看

def bs4_paraser(html):
 all_value = []
 value = {}
 soup = BeautifulSoup(html, 'html.parser')
 # 獲取影評的部分
 all_div = soup.find_all('div', attrs={'class': 'yingping-list-wrap'}, limit=1)
 for row in all_div:
  # 獲取每一個(gè)影評，即影評的item
  all_div_item = row.find_all('div', attrs={'class': 'item'})
  for r in all_div_item:
   # 獲取影評的標(biāo)題部分
   title = r.find_all('div', attrs={'class': 'g-clear title-wrap'}, limit=1)
   if title is not None and len(title) > 0:
    value['title'] = title[0].a.string
    value['title_href'] = title[0].a['href']
    score_text = title[0].div.span.span['style']
    score_text = re.search(r'\d+', score_text).group()
    value['score'] = int(score_text) / 20
    # 時(shí)間
    value['time'] = title[0].div.find_all('span', attrs={'class': 'time'})[0].string
    # 多少人喜歡
    value['people'] = int(
      re.search(r'\d+', title[0].find_all('div', attrs={'class': 'num'})[0].span.string).group())
   # print r
   all_value.append(value)
   value = {}
 return all_value

3，使用SGMLParser，主要是通過start、end tag的方式進(jìn)行了，解析工程比較明朗，但是有點(diǎn)麻煩，而且該案例的場景不太適合該方法，（哈哈）

class CommentParaser(SGMLParser):
 def __init__(self):
  SGMLParser.__init__(self)
  self.__start_div_yingping = False
  self.__start_div_item = False
  self.__start_div_gclear = False
  self.__start_div_ratingwrap = False
  self.__start_div_num = False
  # a
  self.__start_a = False
  # span 3中狀態(tài)
  self.__span_state = 0
  # 數(shù)據(jù)
  self.__value = {}
  self.data = []
 
 def start_div(self, attrs):
  for k, v in attrs:
   if k == 'class' and v == 'yingping-list-wrap':
    self.__start_div_yingping = True
   elif k == 'class' and v == 'item':
    self.__start_div_item = True
   elif k == 'class' and v == 'g-clear title-wrap':
    self.__start_div_gclear = True
   elif k == 'class' and v == 'rating-wrap g-clear':
    self.__start_div_ratingwrap = True
   elif k == 'class' and v == 'num':
    self.__start_div_num = True
 
 def end_div(self):
  if self.__start_div_yingping:
   if self.__start_div_item:
    if self.__start_div_gclear:
     if self.__start_div_num or self.__start_div_ratingwrap:
      if self.__start_div_num:
       self.__start_div_num = False
      if self.__start_div_ratingwrap:
       self.__start_div_ratingwrap = False
     else:
      self.__start_div_gclear = False
    else:
     self.data.append(self.__value)
     self.__value = {}
     self.__start_div_item = False
   else:
    self.__start_div_yingping = False
 
 def start_a(self, attrs):
  if self.__start_div_yingping and self.__start_div_item and self.__start_div_gclear:
   self.__start_a = True
   for k, v in attrs:
    if k == 'href':
     self.__value['href'] = v
 
 def end_a(self):
  if self.__start_div_yingping and self.__start_div_item and self.__start_div_gclear and self.__start_a:
   self.__start_a = False
 
 def start_span(self, attrs):
  if self.__start_div_yingping and self.__start_div_item and self.__start_div_gclear:
   if self.__start_div_ratingwrap:
    if self.__span_state != 1:
     for k, v in attrs:
      if k == 'class' and v == 'rating':
       self.__span_state = 1
      elif k == 'class' and v == 'time':
       self.__span_state = 2
    else:
     for k, v in attrs:
      if k == 'style':
       score_text = re.search(r'\d+', v).group()
     self.__value['score'] = int(score_text) / 20
     self.__span_state = 3
   elif self.__start_div_num:
    self.__span_state = 4
 
 def end_span(self):
  self.__span_state = 0
 
 def handle_data(self, data):
  if self.__start_a:
   self.__value['title'] = data
  elif self.__span_state == 2:
   self.__value['time'] = data
  elif self.__span_state == 4:
   score_text = re.search(r'\d+', data).group()
   self.__value['people'] = int(score_text)
  pass
def sgl_parser(html):
 parser = CommentParaser()
 parser.feed(html)
 return parser.data

4,HTMLParaer，與3原理相識，就是調(diào)用的方法不太一樣，基本上可以公用，

class CommentHTMLParser(HTMLParser.HTMLParser):
 def __init__(self):
  HTMLParser.HTMLParser.__init__(self)
  self.__start_div_yingping = False
  self.__start_div_item = False
  self.__start_div_gclear = False
  self.__start_div_ratingwrap = False
  self.__start_div_num = False
  # a
  self.__start_a = False
  # span 3中狀態(tài)
  self.__span_state = 0
  # 數(shù)據(jù)
  self.__value = {}
  self.data = []
 
 def handle_starttag(self, tag, attrs):
  if tag == 'div':
   for k, v in attrs:
    if k == 'class' and v == 'yingping-list-wrap':
     self.__start_div_yingping = True
    elif k == 'class' and v == 'item':
     self.__start_div_item = True
    elif k == 'class' and v == 'g-clear title-wrap':
     self.__start_div_gclear = True
    elif k == 'class' and v == 'rating-wrap g-clear':
     self.__start_div_ratingwrap = True
    elif k == 'class' and v == 'num':
     self.__start_div_num = True
  elif tag == 'a':
   if self.__start_div_yingping and self.__start_div_item and self.__start_div_gclear:
    self.__start_a = True
    for k, v in attrs:
     if k == 'href':
      self.__value['href'] = v
  elif tag == 'span':
   if self.__start_div_yingping and self.__start_div_item and self.__start_div_gclear:
    if self.__start_div_ratingwrap:
     if self.__span_state != 1:
      for k, v in attrs:
       if k == 'class' and v == 'rating':
        self.__span_state = 1
       elif k == 'class' and v == 'time':
        self.__span_state = 2
     else:
      for k, v in attrs:
       if k == 'style':
        score_text = re.search(r'\d+', v).group()
      self.__value['score'] = int(score_text) / 20
      self.__span_state = 3
    elif self.__start_div_num:
     self.__span_state = 4
 
 def handle_endtag(self, tag):
  if tag == 'div':
   if self.__start_div_yingping:
    if self.__start_div_item:
     if self.__start_div_gclear:
      if self.__start_div_num or self.__start_div_ratingwrap:
       if self.__start_div_num:
        self.__start_div_num = False
       if self.__start_div_ratingwrap:
        self.__start_div_ratingwrap = False
      else:
       self.__start_div_gclear = False
     else:
      self.data.append(self.__value)
      self.__value = {}
      self.__start_div_item = False
    else:
     self.__start_div_yingping = False
  elif tag == 'a':
   if self.__start_div_yingping and self.__start_div_item and self.__start_div_gclear and self.__start_a:
    self.__start_a = False
  elif tag == 'span':
   self.__span_state = 0
 
 def handle_data(self, data):
  if self.__start_a:
   self.__value['title'] = data
  elif self.__span_state == 2:
   self.__value['time'] = data
  elif self.__span_state == 4:
   score_text = re.search(r'\d+', data).group()
   self.__value['people'] = int(score_text)
  pass
def html_parser(html):
 parser = CommentHTMLParser()
 parser.feed(html)
 return parser.data

3,4對于該案例來說確實(shí)是不太適合，趁現(xiàn)在有空記錄下來，功學(xué)習(xí)使用！

以上這篇對Python3 解析html的幾種操作方式小結(jié)就是小編分享給大家的全部內(nèi)容了，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。

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