Python Exception handling

1, Urlerror

Cause of Error:

• Network is not connected, that is, the computer cannot surf the internet
• Cannot connect to a specific server
• Server does not exist

try:except Example:

Import= urllib2. Request ('http://www.xxxxx.com')try: Urllib2.urlopen (Request)  except  urllib2. Urlerror, E:print E.reason

2, httperrorhttperror instance will have a code property, this is the server sends the related error number. Because URLLIB2 can handle redirects for you, that is, the code that starts with 3 can be processed, and a 100-299 range number indicates success, so you can only see 400-599 of the error number.  

req = Urllib2. Request ('http://blog.csdn.net/cqcre')try:    urllib2.urlopen (req) except Urllib2. Httperror, E:    print  e.codeexcept  urllib2. Urlerror, E:    print  e.reasonElse:    Print " OK "

The request method is involved in the example, and the use of this method is self-querying.

Python Exception handling