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-rw-r--r--Lib/asyncio/coroutines.py14
1 files changed, 8 insertions, 6 deletions
diff --git a/Lib/asyncio/coroutines.py b/Lib/asyncio/coroutines.py
index cdb1ea8..71a1ec4 100644
--- a/Lib/asyncio/coroutines.py
+++ b/Lib/asyncio/coroutines.py
@@ -111,12 +111,14 @@ class CoroWrapper:
frame = getattr(gen, 'gi_frame', None)
if frame is not None and frame.f_lasti == -1:
func = events._format_callback(self.func, ())
- tb = ''.join(traceback.format_list(self._source_traceback))
- message = ('Coroutine %s was never yielded from\n'
- 'Coroutine object created at (most recent call last):\n'
- '%s'
- % (func, tb.rstrip()))
- logger.error(message)
+ msg = 'Coroutine %s was never yielded from' % func
+ tb = getattr(self, '_source_traceback', ())
+ if tb:
+ tb = ''.join(traceback.format_list(tb))
+ msg += ('\nCoroutine object created at '
+ '(most recent call last):\n')
+ msg += tb.rstrip()
+ logger.error(msg)
def coroutine(func):