问题： Max retries exceeded with url
解决一：
http://stackoverflow.com/questions/15431044/can-i-set-max-retries-for-requests-request
解决二：
http://obroll.com/max-retries-exceeded-for-url-in-requests-module-python-solved/
A:
B:
http://stackoverflow.com/questions/15431044/can-i-set-max-retries-for-requests-request
requests.adapters.DEFAULT_RETRIES = 5
解决二：
http://obroll.com/max-retries-exceeded-for-url-in-requests-module-python-solved/
A:
proxy = {'http': '33.33.33.10:8118'}
result = requests.get(url, proxies=proxy)
B:
proxy = '33.33.33.11:8118'
result = requests.get(url, proxies={'http': proxy})