Sadly pip search is now permanently banned by python.org.
They said that they are experiencing “hundreds of thousands of search calls per hour” for 100 days(since Nov 14, 2020), and the XMLRPC API, via which the search calls are taking, had already been determined to be deprecated before this happened.
So maybe we need to search for packages directly on pypi.org, or turn to packages like pypi-simple-search or pipsearch.