--- contrib/python/future/py3/future/backports/socket.py	(index)
+++ contrib/python/future/py3/future/backports/socket.py	(working tree)
@@ -94,7 +94,7 @@ class socket(_socket.socket):
 
     """A subclass of _socket.socket adding the makefile() method."""
 
-    __slots__ = ["__weakref__", "_io_refs", "_closed"]
+    __slots__ = ["_io_refs", "_closed"]
 
     def __init__(self, family=AF_INET, type=SOCK_STREAM, proto=0, fileno=None):
         if fileno is None: