From 80ba8240f7133e34337f0b7dfd2db2d52b5840a5 Mon Sep 17 00:00:00 2001
From: Ryan Grout <ryan@ryangrout.org>
Date: Mon, 3 Jul 2017 12:26:02 -0500
Subject: [PATCH] A slightly faster interposed.

Replace the call to islice with a call to next().
---
 toolz/itertoolz.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/toolz/itertoolz.py b/toolz/itertoolz.py
index 2462c5fb..a25eea3c 100644
--- a/toolz/itertoolz.py
+++ b/toolz/itertoolz.py
@@ -520,8 +520,9 @@ def interpose(el, seq):
     >>> list(interpose("a", [1, 2, 3]))
     [1, 'a', 2, 'a', 3]
     """
-    combined = zip(itertools.repeat(el), seq)
-    return drop(1, concat(combined))
+    inposed = concat(zip(itertools.repeat(el), seq))
+    next(inposed)
+    return inposed
 
 
 def frequencies(seq):