[Python]-problems found when using Chardet to check page encoding formats

The following problems were recently found when using Chardet to check the page encoding format:

Open the Web page with Urllib and check the encoding format and open the Web page with URLLIB2 to check the encoding format results are different, so urllib2 open may cause problems, need attention.

Use URLLIB2 to open the Web page and check the encoding format:

As a result, there is a case in which the character encoding of the Sina network is none:

However, if you use Urllib to open the URL, there is no problem checking the encoding format:

The result of the run, the character encoding of all URLs is detected, the result is as follows:

[Python]-problems found when using Chardet to check page encoding formats