Python Crawler Tutorial -09-error module

Python Crawler Tutorial -09-error module

Today's protagonist is the error, crawl, it is easy to appear wrong, so we have to do in the code, common mistakes in the place, about Urllib.error

Urlerror

• Reasons for Urlerror production:
  • 1. No network connection
  • 2. Server Connection failure
  • 3. The specified server could not be found
  • 4.URLError is a subclass of OSError
  • Case V9 File: https://xpwi.github.io/py/py%E7%88%AC%E8%99%AB/py09error.py

# 案例v9# URLError的使用from urllib import  request,errorif __name__ == ‘__main__‘:    url = "http://www.baiiiiiiiiiiidu.com/"    try:        req = request.Request(url)        rsp = request.urlopen(req)        html = rsp.read().decode()        print(html)    except error.URLError as e:        print("URLError:{0}".format(e.reason))        print("URLError:{0}".format(e))    except Exception as e:        print(e)

Httperror

• 1. is a subclass of Urlerror

The difference between Urlerror and Httperror:

• Httperror is a return code error for the corresponding HTTP request, and if the return error code is more than 400, the httperror is raised
• Urlerror corresponds to a network problem, including URL problems
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Python Crawler Tutorial -09-error module