From: Raymond Hettinger <rhettinger@users.noreply.github.com>
Date: Wed, 3 Apr 2024 15:08:18 +0000 (-0500)
Subject: gh-117215 Make the fromskey() signature match dict.fromkeys(). (gh-117493)
X-Git-Tag: v3.13.0a6~56
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=03f7aaf953f00bf2953c21a057d8e6e88db659c8;p=thirdparty%2FPython%2Fcpython.git

gh-117215 Make the fromskey() signature match dict.fromkeys(). (gh-117493)
---

diff --git a/Lib/collections/__init__.py b/Lib/collections/__init__.py
index 2a35989ee25a..d06d84cbdfcc 100644
--- a/Lib/collections/__init__.py
+++ b/Lib/collections/__init__.py
@@ -1038,9 +1038,9 @@ class ChainMap(_collections_abc.MutableMapping):
         return f'{self.__class__.__name__}({", ".join(map(repr, self.maps))})'
 
     @classmethod
-    def fromkeys(cls, iterable, *args):
-        'Create a ChainMap with a single dict created from the iterable.'
-        return cls(dict.fromkeys(iterable, *args))
+    def fromkeys(cls, iterable, value=None, /):
+        'Create a new ChainMap with keys from iterable and values set to value.'
+        return cls(dict.fromkeys(iterable, value))
 
     def copy(self):
         'New ChainMap or subclass with a new copy of maps[0] and refs to maps[1:]'