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bpo-42772: Step argument ignored when stop is None. (GH-24018)

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Raymond Hettinger 2021-01-02 10:24:51 -08:00 • committed by GitHub
parent 607501abb4
commit 768fa145cf
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3 changed files with 17 additions and 1 deletions
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8
Lib/random.py
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@ -96,6 +96,7 @@ LOG4 = _log(4.0)
SG_MAGICCONST = 1.0 + _log(4.5)
BPF = 53 # Number of bits in a float
RECIP_BPF = 2 ** -BPF
_ONE = 1
class Random(_random.Random):
@ -288,7 +289,7 @@ class Random(_random.Random):
## -------------------- integer methods -------------------
def randrange(self, start, stop=None, step=1):
def randrange(self, start, stop=None, step=_ONE):
"""Choose a random item from range(start, stop[, step]).
This fixes the problem with randint() which includes the
@ -311,7 +312,12 @@ class Random(_random.Random):
_warn('randrange() will raise TypeError in the future',
DeprecationWarning, 2)
raise ValueError("non-integer arg 1 for randrange()")
if stop is None:
# We don't check for "step != 1" because it hasn't been
# type checked and converted to an integer yet.
if step is not _ONE:
raise TypeError('Missing a non-None stop argument')
if istart > 0:
return self._randbelow(istart)
raise ValueError("empty range for randrange()")