[Python-checkins] asyncio: Remove unused Future._tb_logger attribute (#4596)

[Victor Stinner]

https://github.com/python/cpython/commit/c16bacec3c2f08a74e4dc282f7d84f17ec70d0d5
commit: c16bacec3c2f08a74e4dc282f7d84f17ec70d0d5
branch: master
author: Victor Stinner <victor.stinner at gmail.com>
committer: GitHub <noreply at github.com>
date: 2017-11-28T00:35:33+01:00
summary:

asyncio: Remove unused Future._tb_logger attribute (#4596)

It was only used on Python 3.3, now only Future._log_traceback is
used.

files:
M Lib/asyncio/futures.py

diff --git a/Lib/asyncio/futures.py b/Lib/asyncio/futures.py
index 472f2a8c74e..b2e57efdb66 100644
--- a/Lib/asyncio/futures.py
+++ b/Lib/asyncio/futures.py
@@ -63,8 +63,7 @@ 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.
@@ -156,9 +155,6 @@ def result(self):
         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
@@ -176,9 +172,6 @@ def exception(self):
         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):