From 091e95e9004b794280ab35becec2c3e30dd5e96e Mon Sep 17 00:00:00 2001
From: Wolfgang Maier <wolfgang.maier@biologie.uni-freiburg.de>
Date: Thu, 5 Apr 2018 17:19:44 +0200
Subject: bpo-33203: Ensure random.choice always raises IndexError on empty
 sequence (GH-6338)

---
 Lib/random.py | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'Lib/random.py')

diff --git a/Lib/random.py b/Lib/random.py
index 91065b7e30..0bc24174e1 100644
--- a/Lib/random.py
+++ b/Lib/random.py
@@ -242,6 +242,8 @@ class Random(_random.Random):
                 "enough bits to choose from a population range this large.\n"
                 "To remove the range limitation, add a getrandbits() method.")
             return int(random() * n)
+        if n == 0:
+            raise ValueError("Boundary cannot be zero")
         rem = maxsize % n
         limit = (maxsize - rem) / maxsize   # int(limit * maxsize) % n == 0
         r = random()
-- 
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