diff options
Diffstat (limited to 'Lib/collections/__init__.py')
| -rw-r--r-- | Lib/collections/__init__.py | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/Lib/collections/__init__.py b/Lib/collections/__init__.py index 707c53b..ca92c3c 100644 --- a/Lib/collections/__init__.py +++ b/Lib/collections/__init__.py @@ -816,9 +816,14 @@ class ChainMap(MutableMapping): __copy__ = copy - def new_child(self): # like Django's Context.push() - 'New ChainMap with a new dict followed by all previous maps.' - return self.__class__({}, *self.maps) + def new_child(self, m=None): # like Django's Context.push() + ''' + New ChainMap with a new map followed by all previous maps. If no + map is provided, an empty dict is used. + ''' + if m is None: + m = {} + return self.__class__(m, *self.maps) @property def parents(self): # like Django's Context.pop() |