Don't use mutable values for method defaults.
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 @@
"""
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