Replace all remaining six usage with native Python 3 equivalents (#7704)

synapse/federation/federation_base.py

@@ -17,8 +17,6 @@ import logging
 from collections import namedtuple
 from typing import Iterable, List
 
-import six
-
 from twisted.internet import defer
 from twisted.internet.defer import Deferred, DeferredList
 from twisted.python.failure import Failure
@@ -294,7 +292,7 @@ def event_from_pdu_json(
     assert_params_in_dict(pdu_json, ("type", "depth"))
 
     depth = pdu_json["depth"]
-    if not isinstance(depth, six.integer_types):
+    if not isinstance(depth, int):
         raise SynapseError(400, "Depth %r not an intger" % (depth,), Codes.BAD_JSON)
 
     if depth < 0:

synapse/federation/federation_server.py

@@ -17,8 +17,6 @@
 import logging
 from typing import Any, Callable, Dict, List, Match, Optional, Tuple, Union
 
-import six
-
 from canonicaljson import json
 from prometheus_client import Counter
 
@@ -751,7 +749,7 @@ def server_matches_acl_event(server_name: str, acl_event: EventBase) -> bool:
 
 
 def _acl_entry_matches(server_name: str, acl_entry: str) -> Match:
-    if not isinstance(acl_entry, six.string_types):
+    if not isinstance(acl_entry, str):
         logger.warning(
             "Ignoring non-str ACL entry '%s' (is %s)", acl_entry, type(acl_entry)
         )

synapse/federation/transport/client.py

@@ -15,10 +15,9 @@
 # limitations under the License.
 
 import logging
+import urllib
 from typing import Any, Dict, Optional
 
-from six.moves import urllib
-
 from twisted.internet import defer
 
 from synapse.api.constants import Membership