[lint] Do log formating lazily

Convert log("fmt" % args) to log("fmt", args) as the latter is lazy and
does not do the formating if the string is never logged.

discord/gateway.py

@@ -70,7 +70,7 @@ class KeepAliveHandler(threading.Thread):
     def run(self):
         while not self._stop_ev.wait(self.interval):
             if self._last_ack + self.heartbeat_timeout < time.perf_counter():
-                log.warning("Shard ID %s has stopped responding to the gateway. Closing and restarting." % self.shard_id)
+                log.warning("Shard ID %s has stopped responding to the gateway. Closing and restarting.", self.shard_id)
                 coro = self.ws.close(4000)
                 f = asyncio.run_coroutine_threadsafe(coro, loop=self.ws.loop)
 
@@ -370,7 +370,7 @@ class DiscordWebSocket(websockets.client.WebSocketClientProtocol):
 
                 self.sequence = None
                 self.session_id = None
-                log.info('Shard ID %s session has been invalidated.' % self.shard_id)
+                log.info('Shard ID %s session has been invalidated.', self.shard_id)
                 await self.identify()
                 return
 

discord/opus.py

@@ -44,14 +44,14 @@ EncoderStructPtr = ctypes.POINTER(EncoderStruct)
 
 def _err_lt(result, func, args):
     if result < 0:
-        log.info('error has happened in {0.__name__}'.format(func))
+        log.info('error has happened in %s', func.__name__)
         raise OpusError(result)
     return result
 
 def _err_ne(result, func, args):
     ret = args[-1]._obj
     if ret.value != 0:
-        log.info('error has happened in {0.__name__}'.format(func))
+        log.info('error has happened in %s', func.__name__)
         raise OpusError(ret.value)
     return result