From abf8a56e68a38f5bcff1fa1aa3742ff35854dd45 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Tue, 12 Oct 2004 09:12:16 +0000
Subject: Don't use mutable values for method defaults.

---
 Lib/decimal.py | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/Lib/decimal.py b/Lib/decimal.py
index 0df046d..e4c3344 100644
--- a/Lib/decimal.py
+++ b/Lib/decimal.py
@@ -2161,11 +2161,15 @@ class Context(object):
     """
 
     def __init__(self, prec=None, rounding=None,
-                 traps=None, flags=[],
+                 traps=None, flags=None,
                  _rounding_decision=None,
                  Emin=None, Emax=None,
                  capitals=None, _clamp=0,
-                 _ignored_flags=[]):
+                 _ignored_flags=None):
+        if flags is None:
+            flags = []
+        if _ignored_flags is None:
+            _ignored_flags = []
         if not isinstance(flags, dict):
             flags = dict([(s,s in flags) for s in _signals])
             del s
-- 
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