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bpo-41421: Algebraic simplification for random.paretovariate() (GH-21695)

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Raymond Hettinger 2020-08-01 01:18:26 -07:00 committed by GitHub
parent cadda52d97
commit 5c3270939c
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2 changed files with 4 additions and 1 deletions
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2
Lib/random.py
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@ -749,7 +749,7 @@ class Random(_random.Random):
# Jain, pg. 495
u = 1.0 - self.random()
return 1.0 / u ** (1.0 / alpha)
return u ** (-1.0 / alpha)
def weibullvariate(self, alpha, beta):
"""Weibull distribution.

3
Misc/NEWS.d/next/Library/2020-08-01-00-51-15.bpo-41421.dHKRVB.rst Normal file
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@ -0,0 +1,3 @@
Make an algebraic simplification to random.paretovariate(). It now is
slightly less subject to round-off error and is slightly faster. Inputs that
used to cause ZeroDivisionError now cause an OverflowError instead.