Import HTTPError from urllib.error instead of urllib.request.
import io
import hashlib
from base64 import standard_b64encode
-from urllib.request import urlopen, Request, HTTPError
+from urllib.error import HTTPError
+from urllib.request import urlopen, Request
from urllib.parse import urlparse
from distutils.errors import DistutilsError, DistutilsOptionError
from distutils.core import PyPIRCCommand
import os
import unittest
import unittest.mock as mock
-from urllib.request import HTTPError
+from urllib.error import HTTPError
from test.support import run_unittest