Switch metaclass initialization to python 3-compatible syntax (#8326)

1 files changed, 1 insertions, 3 deletions

diff --git a/synapse/handlers/room_member.py b/synapse/handlers/room_member.py
index 01a6e88262..8feba8c90a 100644
--- a/synapse/handlers/room_member.py
+++ b/synapse/handlers/room_member.py
@@ -51,14 +51,12 @@ if TYPE_CHECKING:
 logger = logging.getLogger(__name__)
 
 
-class RoomMemberHandler:
+class RoomMemberHandler(metaclass=abc.ABCMeta):
     # TODO(paul): This handler currently contains a messy conflation of
     #   low-level API that works on UserID objects and so on, and REST-level
     #   API that takes ID strings and returns pagination chunks. These concerns
     #   ought to be separated out a lot better.
 
-    __metaclass__ = abc.ABCMeta
-
     def __init__(self, hs: "HomeServer"):
         self.hs = hs
         self.store = hs.get_datastore()