web crawling(plus3) errors solution

301 moved permanently

302 found

303 not modified

400 bad request

401 unauthorized

403 forbidden

404 not found

500 internal server error

501 not implementedh

URLError >HTTPError

URLError: not linked the internal server: no web connection; remote url not exit; HTTPError

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import urllib.error
import urllib.request
try:
 ???urllib.request.urlopen("http://blog.cssdn.net")
except urllib.error.URLError as e:
 ???if hasattr(e,"code"):
 ???????print(e.code)
 ???????if hasattr(e,"reason"):
 ???????????print(e.reason)

web crawling(plus3) errors solution

原文地址：http://www.cnblogs.com/rabbittail/p/7620347.html