Python requests获取网页常用方法解析

class Crawler(object):
 """
 采集类
 """
 def __init__(self, base_url):
  self._base_url = base_url
  self._cookie = None
  self._getCookie()

 def _getCookie(self):
  """
  获取站点cookie
  :return:
  """
  try:
   res = requests.get(self._base_url)
   res.raise_for_status()
   # TODO response.cookies获取到的是一个cookiejar对象，需要使用requests.utils.dict_from_cookiejar来
   # TODO 将cookiejar对象转换为一个字典，这个字典后续使用的时候，在请求时直接传入就可以了，
   # 如 requests.get(url, cookies=cookies)
   self._cookie = requests.utils.dict_from_cookiejar(res.cookies)
   print self._cookie
  except Exception as e:
   print e

 def get_html_text(self, url, **kwargs):
  """
  爬取网页的通用代码框架
  :param url:
  :param method:
  :param kwargs:
  :return:
  """
  try:
   kwargs.setdefault('cookies', self._cookie)
   res = requests.get(url, **kwargs)
   # TODO 若响应状态码不是200, 抛出 HTTPError 异常
   res.raise_for_status()
   res.encoding = res.apparent_encoding
   # print requests.utils.dict_from_cookiejar(res.cookies)
   return res.text
  except Exception as e:
   print traceback.print_exc()
   return