diff options
Diffstat (limited to 'Lib/collections/__init__.py')
| -rw-r--r-- | Lib/collections/__init__.py | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/Lib/collections/__init__.py b/Lib/collections/__init__.py index 9f55a3e..9453320 100644 --- a/Lib/collections/__init__.py +++ b/Lib/collections/__init__.py @@ -12,7 +12,7 @@ from operator import itemgetter as _itemgetter, eq as _eq from keyword import iskeyword as _iskeyword import sys as _sys import heapq as _heapq -from weakref import proxy as _proxy +from _weakref import proxy as _proxy from itertools import repeat as _repeat, chain as _chain, starmap as _starmap from reprlib import recursive_repr as _recursive_repr @@ -820,9 +820,14 @@ 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() |