remove redundant `__func__`

this is a no-op under python 3

synapse/replication/slave/storage/_base.py

@@ -16,8 +16,6 @@
 import logging
 from typing import Optional
 
-import six
-
 from synapse.storage.data_stores.main.cache import CacheInvalidationWorkerStore
 from synapse.storage.database import Database
 from synapse.storage.engines import PostgresEngine
@@ -26,13 +24,6 @@ from synapse.storage.util.id_generators import MultiWriterIdGenerator
 logger = logging.getLogger(__name__)
 
 
-def __func__(inp):
-    if six.PY3:
-        return inp
-    else:
-        return inp.__func__
-
-
 class BaseSlavedStore(CacheInvalidationWorkerStore):
     def __init__(self, database: Database, db_conn, hs):
         super(BaseSlavedStore, self).__init__(database, db_conn, hs)

synapse/replication/slave/storage/presence.py

@@ -18,7 +18,7 @@ from synapse.storage.data_stores.main.presence import PresenceStore
 from synapse.storage.database import Database
 from synapse.util.caches.stream_change_cache import StreamChangeCache
 
-from ._base import BaseSlavedStore, __func__
+from ._base import BaseSlavedStore
 from ._slaved_id_tracker import SlavedIdTracker
 
 
@@ -27,14 +27,14 @@ class SlavedPresenceStore(BaseSlavedStore):
         super(SlavedPresenceStore, self).__init__(database, db_conn, hs)
         self._presence_id_gen = SlavedIdTracker(db_conn, "presence_stream", "stream_id")
 
-        self._presence_on_startup = self._get_active_presence(db_conn)
+        self._presence_on_startup = self._get_active_presence(db_conn)  # type: ignore
 
         self.presence_stream_cache = StreamChangeCache(
             "PresenceStreamChangeCache", self._presence_id_gen.get_current_token()
         )
 
-    _get_active_presence = __func__(DataStore._get_active_presence)
-    take_presence_startup_info = __func__(DataStore.take_presence_startup_info)
+    _get_active_presence = DataStore._get_active_presence
+    take_presence_startup_info = DataStore.take_presence_startup_info
     _get_presence_for_user = PresenceStore.__dict__["_get_presence_for_user"]
     get_presence_for_users = PresenceStore.__dict__["get_presence_for_users"]