Merge pull request #408 from groutr/faster-second

eriknw · web-flow · commit 68d8df846f2c · 2018-08-15T09:09:15.000-05:00
Avoid islice overhead in itertoolz.second
diff --git a/toolz/itertoolz.py b/toolz/itertoolz.py
@@ -380,7 +380,9 @@ def second(seq):
     >>> second('ABC')
     'B'
     """
-    return next(itertools.islice(seq, 1, None))
+    seq = iter(seq)
+    next(seq)
+    return next(seq)
 
 
 def nth(n, seq):
