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log2() is faster than log() #95214

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rhettinger merged 1 commit into from
Jul 24, 2022
+3 −3
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log2() is faster than log() #95214

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6 changes: 3 additions & 3 deletions Lib/random.py
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Original file line number Diff line number Diff line change
Expand Up @@ -50,7 +50,7 @@
from math import log as _log, exp as _exp, pi as _pi, e as _e, ceil as _ceil
from math import sqrt as _sqrt, acos as _acos, cos as _cos, sin as _sin
from math import tau as TWOPI, floor as _floor, isfinite as _isfinite
from math import lgamma as _lgamma, fabs as _fabs
from math import lgamma as _lgamma, fabs as _fabs, log2 as _log2
from os import urandom as _urandom
from _collections_abc import Sequence as _Sequence
from operator import index as _index
Expand Down Expand Up @@ -764,11 +764,11 @@ def binomialvariate(self, n=1, p=0.5):
# BG: Geometric method by Devroye with running time of O(np).
# https://dl.acm.org/doi/pdf/10.1145/42372.42381
x = y = 0
c = _log(1.0 - p)
c = _log2(1.0 - p)
if not c:
return x
while True:
y += _floor(_log(random()) / c) + 1
y += _floor(_log2(random()) / c) + 1
if y > n:
return x
x += 1
Expand Down