Issue #10093: ResourceWarnings are now issued when files and sockets are

deallocated without explicit closing.  These warnings are silenced by
default, except in pydebug mode.

Lib/socket.py

@@ -108,7 +108,7 @@ def __repr__(self):
         if s.startswith("<socket object"):
             s = "<%s.%s%s%s" % (self.__class__.__module__,
                                 self.__class__.__name__,
-                                (self._closed and " [closed] ") or "",
+                                getattr(self, '_closed', False) and " [closed] " or "",
                                 s[7:])
         return s