Update Lib/multiprocessing/resource_tracker.py

Co-authored-by: Gregory P. Smith <greg@krypto.org>

Author: graingert

Lib/multiprocessing/resource_tracker.py

@@ -253,7 +253,7 @@ def _write(self, msg):
         assert nbytes == len(msg), f"{nbytes=} != {len(msg)=}"
 
     def _send(self, cmd, name, rtype):
-        msg = '{0}:{1}:{2}\n'.format(cmd, name, rtype).encode('ascii')
+        msg = f"{cmd}:{name}:{rtype}\n".encode("ascii")        
         if len(msg) > 512:
             # posix guarantees that writes to a pipe of less than PIPE_BUF
             # bytes are atomic, and that PIPE_BUF >= 512