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If python was configured without-threads:
% ./python
Python 2.7.2+ (2.7:e71e4bd45c89, Dec 28 2011, 21:03:59) 
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import dummy_threading as _threading
>>> a = _threading.local()
>>> del a
Exception ImportError: ImportError('No module named thread',) in <bound method local.__del__ of <_threading_local.local object at 0xb7681694>> ignored
Patch to mute this Exception:
diff --git a/Lib/_threading_local.py b/Lib/_threading_local.py
--- a/Lib/_threading_local.py
+++ b/Lib/_threading_local.py
@@ -221,7 +221,13 @@
 lock.release()
 
 def __del__(self):
- import threading
+ try:
+ import threading
+ except ImportError:
+ import sys
+ if '_dummy_threading' in sys.modules:
+ return
+ raise
 
 key = object.__getattribute__(self, '_local__key')