New submission from Brian Nenninger:
secrets.randbelow(-1) causes the interpreter to hang. It should presumably
raise an exception like secrets.randbelow(0) does. This is on Mac OS X 10.11.6,
shell transcript below.
=========================================================
$ python3
Python 3.6.0 (v3.6.0:41df79263a11, Dec 22 2016, 17:23:13)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import secrets
>>> secrets.randbelow(1)
0
>>> secrets.randbelow(0)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File
"/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/secrets.py",
line 29, in randbelow
return _sysrand._randbelow(exclusive_upper_bound)
File
"/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/random.py",
line 232, in _randbelow
r = getrandbits(k) # 0 <= r < 2**k
File
"/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/random.py",
line 678, in getrandbits
raise ValueError('number of bits must be greater than zero')
ValueError: number of bits must be greater than zero
>>> secrets.randbelow(-1)
(hangs using 100% CPU until aborted)
----------
components: Library (Lib)
messages: 283923
nosy: Brian Nenninger
priority: normal
severity: normal
status: open
title: secrets.randbelow(-1) hangs
type: behavior
versions: Python 3.6
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29061>
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