bpo-33203: Ensure random.choice always raises IndexError on empty sequence (GH-6338) (GH-6387)
(cherry picked from commit 091e95e9004b794280ab35becec2c3e30dd5e96e)
Co-authored-by: Wolfgang Maier <wolfgang.maier@biologie.uni-freiburg.de>
diff --git a/Lib/random.py b/Lib/random.py
index 91065b7..0bc2417 100644
--- a/Lib/random.py
+++ b/Lib/random.py
@@ -242,6 +242,8 @@
"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()