What is the use of URLError in python crawlers

This article is about the usefulness of URLError in python crawlers. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Description

1. The error module from the urlib library inherits the OSError class and is the base class of the error exception module. The exceptions generated by the request module are handled by catching classes.

2. There is an attribute reason, which is the reason for the error returned.

Example

From urllib import request, errortry: response = request.urlopen ('http://cuiqingcai.com/index.htm')except error.URLError as e: print (e.reason))

When we open a page that does not exist, we should report an error, but then we catch the exception URLError, and the result is as follows:

Not Found

The program does not report an error directly, but outputs the above content, so that by doing so, we can avoid abnormal termination of the program, and the exception is handled effectively.

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