$ python2 --version
Python 2.7.17
$ python3 --version
Python 3.6.9

 $ pip --version
pip 9.0.1 from /usr/lib/python2.7/dist-packages (python 2.7)
$ pip3 --version
WARNING: pip is being invoked by an old script wrapper. This will fail in a future version of pip.
Please see https://github.com/pypa/pip/issues/5599 for advice on fixing the underlying issue.
To avoid this problem you can invoke Python with '-m pip' instead of running pip directly.
pip 20.3.3 from /home/medusa/.local/lib/python3.6/site-packages/pip (python 3.6)

 $ sudo pip3 search pandas
WARNING: pip is being invoked by an old script wrapper. This will fail in a future version of pip.
Please see https://github.com/pypa/pip/issues/5599 for advice on fixing the underlying issue.
To avoid this problem you can invoke Python with '-m pip' instead of running pip directly.
WARNING: The directory '/home/medusa/.cache/pip' or its parent directory is not owned or is not writable by the current user. The cache has been disabled. Check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
ERROR: Exception:
Traceback (most recent call last):
  File "/home/medusa/.local/lib/python3.6/site-packages/pip/_internal/cli/base_command.py", line 224, in _main
    status = self.run(options, args)
  File "/home/medusa/.local/lib/python3.6/site-packages/pip/_internal/commands/search.py", line 62, in run
    pypi_hits = self.search(query, options)
  File "/home/medusa/.local/lib/python3.6/site-packages/pip/_internal/commands/search.py", line 82, in search
    hits = pypi.search({'name': query, 'summary': query}, 'or')
  File "/usr/lib/python3.6/xmlrpc/client.py", line 1112, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python3.6/xmlrpc/client.py", line 1452, in __request
    verbose=self.__verbose
  File "/home/medusa/.local/lib/python3.6/site-packages/pip/_internal/network/xmlrpc.py", line 46, in request
    return self.parse_response(response.raw)
  File "/usr/lib/python3.6/xmlrpc/client.py", line 1342, in parse_response
    return u.close()
  File "/usr/lib/python3.6/xmlrpc/client.py", line 656, in close
    raise Fault(**self._stack[0])
xmlrpc.client.Fault: <Fault -32500: "RuntimeError: PyPI's XMLRPC API has been temporarily disabled due to unmanageable load and will be deprecated in the near future. See https://status.python.org/ for more information.">

 $ pip search zlo