python3如何解析html

python

解析html是爬虫后的重要的一个处理数据的环节。一下记录解析html的几种方式。

先介绍基础的辅助函数,主要用于获取html并输入解析后的结束。

#把传递解析函数,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的方式进行解析。

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. [官网](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:

  # 获取每一个影评,即影评的item

  all_div_item = row.xpath('.//div[@class="item"]') # find_all('div', attrs={'class': 'item'})

  for r in all_div_item:

   value = {}

   # 获取影评的标题部分

   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

   # 时间

   value['time'] = title[0].xpath('./div/span[@class="time"]/text()')[0]

   # 多少人喜欢

   value['people'] = int(

     re.search(r'd+', title[0].xpath('./div[@class="num"]/span/text()')[0]).group())

   data.append(value)

 return data

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2、使用BeautifulSoup,不多说了,大家网上找资料看看。

def bs4_paraser(html):

 all_value = []

 value = {}

 soup = BeautifulSoup(html, 'html.parser')

 # 获取影评的部分

 all_div = soup.find_all('div', attrs={'class': 'yingping-list-wrap'}, limit=1)

 for row in all_div:

  # 获取每一个影评,即影评的item

  all_div_item = row.find_all('div', attrs={'class': 'item'})

  for r in all_div_item:

   # 获取影评的标题部分

   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

    # 时间

    value['time'] = title[0].div.find_all('span', attrs={'class': 'time'})[0].string

    # 多少人喜欢

    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,主要是通过start、end tag的方式进行,解析工程比较明朗,但是有点麻烦,而该案例的场景不太适合该方法。

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中状态

  self.__span_state = 0

  # 数据

  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,与3原理相识,就是调用的方法不太一样,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中状态

  self.__span_state = 0

  # 数据

  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

以上是 python3如何解析html 的全部内容, 来源链接: utcz.com/z/521219.html

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