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bpo-33203: Ensure random.choice always raises IndexError on empty sequence (GH-6338)

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Wolfgang Maier 2018-04-05 17:19:44 +02:00 • committed by Raymond Hettinger
parent 74940913d2
commit 091e95e900
3 changed files with 9 additions and 1 deletions
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2
Lib/random.py
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@ -242,6 +242,8 @@ def _randbelow(self, n, int=int, maxsize=1<<BPF, type=type,
"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()