Don't use mutable values for method defaults.

2004-10-12 09:12:16 +00:00 · 2004-10-12 09:12:16 +00:00 · abf8a56e68
parent f3958f16cf
commit abf8a56e68
1 changed files with 6 additions and 2 deletions
--- 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