From 972fb077a022722113e155ebf564f98ebdbe2b65 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Mon, 3 Mar 2008 22:04:55 +0000
Subject: [PATCH] Remove dependency on itertools -- a simple genexp suffices.

---
 Lib/_abcoll.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Lib/_abcoll.py b/Lib/_abcoll.py
index b8f6fb94c8..7a01e1dc24 100644
--- a/Lib/_abcoll.py
+++ b/Lib/_abcoll.py
@@ -9,7 +9,6 @@ bootstrapping issues.  Unit tests are in test_collections.
 """
 
 from abc import ABCMeta, abstractmethod
-import itertools
 
 __all__ = ["Hashable", "Iterable", "Iterator",
            "Sized", "Container", "Callable",
@@ -189,7 +188,8 @@ class Set(Sized, Iterable, Container):
     def __or__(self, other):
         if not isinstance(other, Iterable):
             return NotImplemented
-        return self._from_iterable(itertools.chain(self, other))
+        chain = (e for s in (self, other) for e in s)
+        return self._from_iterable(chain)
 
     def __sub__(self, other):
         if not isinstance(other, Set):
-- 
2.50.1