Python urllib2 urlopen 503 error

When sending a request to the site, there has been a 503 error, the code is as follows:

　　　　HTTP Error 503: Service Unavailable

Query network reasons, mainly the other side of the automatic query is limited, you can modify the header to deceive him, but this method is not always valid, you can refer to the link:

Http://stackoverflow.com/questions/25936072/python-urllib2-httperror-http-error-503-service-unavailable-on-valid-website

But I did a reset of the header in the code, in the following way:

Request.add_header (

' User-agent ',

Agent
)

After careful observation, the original method is not correct, modify the following:

Request.add_header = [(' User-agent ', agent)]

Without the above errors, although there are other errors, but still in a careful study, here to make a record of it.

　　

　　

　　

Python urllib2 urlopen 503 error