Retrying (Retry (total = 4, connect = None, read = None, redirect = None, status = None) appears through pip installation in python

Screenshot of the problem:

 

 

 

Reason for analysis: The connection timed out and the installation package could not be downloaded

 

Solution: Solution: pip install ddt -i http://pypi.douban.com/simple --trusted-host pypi.douban.com (where ddt is the library you need to download, change according to your actual needs)