From f54e40520098f8e28bb1dd8d8f0a79316d5ea7fc Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Tue, 28 Nov 2017 01:32:28 -0800
Subject: asyncio: Remove unused Future._tb_logger attribute (GH-4596) (#4598)

It was only used on Python 3.3, now only Future._log_traceback is
used.
(cherry picked from commit c16bacec3c2f08a74e4dc282f7d84f17ec70d0d5)
---
 Lib/asyncio/futures.py | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/Lib/asyncio/futures.py b/Lib/asyncio/futures.py
index 047b132..9ff1430 100644
--- a/Lib/asyncio/futures.py
+++ b/Lib/asyncio/futures.py
@@ -143,8 +143,7 @@ class Future:
     #   `yield Future()` (incorrect).
     _asyncio_future_blocking = False
 
-    _log_traceback = False   # Used for Python 3.4 and later
-    _tb_logger = None        # Used for Python 3.3 only
+    _log_traceback = False
 
     def __init__(self, *, loop=None):
         """Initialize the future.
@@ -240,9 +239,6 @@ class Future:
         if self._state != _FINISHED:
             raise InvalidStateError('Result is not ready.')
         self._log_traceback = False
-        if self._tb_logger is not None:
-            self._tb_logger.clear()
-            self._tb_logger = None
         if self._exception is not None:
             raise self._exception
         return self._result
@@ -260,9 +256,6 @@ class Future:
         if self._state != _FINISHED:
             raise InvalidStateError('Exception is not set.')
         self._log_traceback = False
-        if self._tb_logger is not None:
-            self._tb_logger.clear()
-            self._tb_logger = None
         return self._exception
 
     def add_done_callback(self, fn):
-- 
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