Simon Percivall added the comment:
Run this a couple of times (it fails for me the first time, but it's a race, so
YMMV):
```
import enum
from concurrent.futures import ThreadPoolExecutor
class MyEnum(enum.IntFlag):
one = 1
with ThreadPoolExecutor() as executor:
print(list(executor.map(MyEnum.one.__or__, range(1000))))
```
An easy fix would be:
```
diff --git a/Lib/enum.py b/Lib/enum.py
index e79b0382eb..eca56ec3a7 100644
--- a/Lib/enum.py
+++ b/Lib/enum.py
@@ -846,7 +846,7 @@ def _decompose(flag, value):
# check for named flags and powers-of-two flags
flags_to_check = [
(m, v)
- for v, m in flag._value2member_map_.items()
+ for v, m in list(flag._value2member_map_.items())
if m.name is not None or _power_of_two(v)
]
members = []
```
----------
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29167>
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