python requests response值判断方式

#jb51.net

import requests
r = None
try:
 r = requests.get("https://jb51.net")
except:
 pass
if r:
 print "ok"

#jb51.net

class Response(object):
 """The :class:`Response <Response>` object, which contains a
 server's response to an HTTP request.
 """

 __attrs__ = [
  '_content', 'status_code', 'headers', 'url', 'history',
  'encoding', 'reason', 'cookies', 'elapsed', 'request'
 ]

 def __init__(self):
  super(Response, self).__init__()

  self._content = False
  self._content_consumed = False

  #: Integer Code of responded HTTP Status, e.g. 404 or 200.
  self.status_code = None

 def __repr__(self):
  return '<Response [%s]>' % (self.status_code)

 def __bool__(self):
  return self.ok

 @property
 def ok(self):
  try:
   self.raise_for_status()
  except HTTPError:
   return False
  return True

 def raise_for_status(self):
 ¦ """Raises stored :class:`HTTPError`, if one occurred."""

 ¦ http_error_msg = ''

 ¦ if 400 <= self.status_code < 500:
 ¦ ¦ http_error_msg = '%s Client Error: %s for url: %s' % (self.status_code, self.reason, self.url)

 ¦ elif 500 <= self.status_code < 600:
 ¦ ¦ http_error_msg = '%s Server Error: %s for url: %s' % (self.status_code, self.reason, self.url)

 ¦ if http_error_msg:
 ¦ ¦ raise HTTPError(http_error_msg, response=self)