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gh-140938: Raise ValueError for infinite inputs to stdev/pstdev (GH-141531)

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Raise ValueError for infinite inputs to stdev/pstdev

---

Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
This commit is contained in:
Raymond Hettinger 2025-11-14 17:25:45 -06:00 • committed by GitHub
parent 1281be1caf
commit f0a8bc737a
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3 changed files with 24 additions and 5 deletions
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18
Lib/statistics.py
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@ -619,9 +619,14 @@ def stdev(data, xbar=None):
if n < 2:
raise StatisticsError('stdev requires at least two data points')
mss = ss / (n - 1)
try:
mss_numerator = mss.numerator
mss_denominator = mss.denominator
except AttributeError:
raise ValueError('inf or nan encountered in data')
if issubclass(T, Decimal):
return _decimal_sqrt_of_frac(mss.numerator, mss.denominator)
return _float_sqrt_of_frac(mss.numerator, mss.denominator)
return _decimal_sqrt_of_frac(mss_numerator, mss_denominator)
return _float_sqrt_of_frac(mss_numerator, mss_denominator)
def pstdev(data, mu=None):
@ -637,9 +642,14 @@ def pstdev(data, mu=None):
if n < 1:
raise StatisticsError('pstdev requires at least one data point')
mss = ss / n
try:
mss_numerator = mss.numerator
mss_denominator = mss.denominator
except AttributeError:
raise ValueError('inf or nan encountered in data')
if issubclass(T, Decimal):
return _decimal_sqrt_of_frac(mss.numerator, mss.denominator)
return _float_sqrt_of_frac(mss.numerator, mss.denominator)
return _decimal_sqrt_of_frac(mss_numerator, mss_denominator)
return _float_sqrt_of_frac(mss_numerator, mss_denominator)
## Statistics for relations between two inputs #############################