From be25ffaa170564a757245e0f2fa9680ac1d33fd2 Mon Sep 17 00:00:00 2001
From: Kattni Rembor <kattni@adafruit.com>
Date: Tue, 18 May 2021 14:26:56 -0400
Subject: [PATCH] Fix slice indices failure.

---
 adafruit_pypixelbuf.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/adafruit_pypixelbuf.py b/adafruit_pypixelbuf.py
index 38e51e8..8273146 100644
--- a/adafruit_pypixelbuf.py
+++ b/adafruit_pypixelbuf.py
@@ -289,7 +289,9 @@ def _set_item(
 
     def __setitem__(self, index, val):
         if isinstance(index, slice):
-            start, stop, step = index.indices(self._pixels)
+            start = index.start if index.start is not None else 0
+            stop = index.stop if index.stop is not None else len(self)
+            step = index.step if index.step is not None else 1
             for val_i, in_i in enumerate(range(start, stop, step)):
                 r, g, b, w = self._parse_color(val[val_i])
                 self._set_item(in_i, r, g, b, w)