Fix cares tests on py2

src/gevent/resolver/dnspython.py

@@ -112,7 +112,7 @@ def _patch_dns():
     def extra_all(mod_name):
         return extras.get(mod_name, ())
 
-    def after_import_hook(dns): # pylint;disable=redefined-outer-name
+    def after_import_hook(dns): # pylint:disable=redefined-outer-name
         # Runs while still in the original patching scope.
         # The dns.rdata:get_rdata_class() function tries to
         # dynamically import modules using __import__ and then walk

src/gevent/tests/test__socket_dns6.py

@@ -10,8 +10,9 @@
 
 from gevent.testing.sysinfo import OSX
 from gevent.testing.sysinfo import RESOLVER_DNSPYTHON
+from gevent.testing.sysinfo import RESOLVER_ARES
 from gevent.testing.sysinfo import PYPY
-
+from gevent.testing.sysinfo import PY2
 
 # We can't control the DNS servers on CI (or in general...)
 # for the system. This works best with the google DNS servers
@@ -45,6 +46,18 @@ def _normalize_result_gethostbyaddr(self, result):
         # of the system and ares. They don't match exactly.
         return ()
 
+    if RESOLVER_ARES and PY2:
+        def _normalize_result_getnameinfo(self, result):
+            # Beginning 2020-07-23,
+            # c-ares returns a scope id on the result:
+            #    ('2001:470:1:18::115%0', 'http')
+            # The standard library does not (on linux or os x).
+            # I've only seen '%0', so only remove that
+            ipaddr, service = result
+            if ipaddr.endswith('%0'):
+                ipaddr = ipaddr[:-2]
+            return (ipaddr, service)
+
     if not OSX and RESOLVER_DNSPYTHON:
         # It raises gaierror instead of socket.error,
         # which is not great and leads to failures.