asyncio, Tulip issue #136: Add get/set_debug() methods to BaseEventLoopTests.
Add also a PYTHONASYNCIODEBUG environment variable to debug coroutines since
Python startup, to be able to debug coroutines defined directly in the asyncio
module.
diff --git a/Lib/asyncio/tasks.py b/Lib/asyncio/tasks.py
index a3e7cdf..cf7b540 100644
--- a/Lib/asyncio/tasks.py
+++ b/Lib/asyncio/tasks.py
@@ -12,6 +12,8 @@
import functools
import inspect
import linecache
+import os
+import sys
import traceback
import weakref
@@ -28,7 +30,8 @@
# before you define your coroutines. A downside of using this feature
# is that tracebacks show entries for the CoroWrapper.__next__ method
# when _DEBUG is true.
-_DEBUG = False
+_DEBUG = (not sys.flags.ignore_environment
+ and bool(os.environ.get('PYTHONASYNCIODEBUG')))
class CoroWrapper: