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Speed up counting in statistics.fmean() #148875

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Merged
rhettinger merged 2 commits into from
Apr 23, 2026
+4 −4
Merged

Speed up counting in statistics.fmean() #148875

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6303c76
Speed up counting in fmean()
rhettinger Apr 22, 2026
0416f7d
Update Lib/statistics.py
rhettinger Apr 22, 2026
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8 changes: 4 additions & 4 deletions Lib/statistics.py
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Original file line number Diff line number Diff line change
Expand Up @@ -136,7 +136,7 @@

from fractions import Fraction
from decimal import Decimal
from itertools import count, groupby, repeat
from itertools import compress, count, groupby, repeat
from bisect import bisect_left, bisect_right
from math import hypot, sqrt, fabs, exp, erfc, tau, log, fsum, sumprod
from math import isfinite, isinf, pi, cos, sin, tan, cosh, asin, atan, acos
Expand Down Expand Up @@ -195,9 +195,9 @@ def fmean(data, weights=None):
n = len(data)
except TypeError:
# Handle iterators that do not define __len__().
counter = count()
total = fsum(map(itemgetter(0), zip(data, counter)))
n = next(counter)
counter = count(1)
total = fsum(compress(data, counter))
n = next(counter) - 1
else:
total = fsum(data)

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