问题描述：

python爬虫异常报错：requests.exceptions.ConnectionError

解决方法：

对于这个错误，stackoverflow给出的解释是

In the event of a network problem (e.g. DNS failure, refused connection, etc), Requests will raise a ConnectionError exception.

翻译过来就是说这是网络问题出现的异常事件（如DNS错误，拒绝连接，等等），这是Requests库中自带的异常

一种解决办法是捕捉基类异常，这种方法可以处理所有的异常情况:

try:
r = requests.get(url, params={’s’: thing})
except requests.exceptions.RequestException as e: # This is the correct syntax
print e
sys.exit(1)

另外一种解决办法是分别处理各种异常，这里面有三种异常：

try:
r = requests.get(url, params={’s’: thing})
except requests.exceptions.Timeout:
except requests.exceptions.TooManyRedirects:
except requests.exceptions.RequestException as e:
print e
sys.exit(1)